## Dive into Grade 4 math excellence with a focus on composite word problems. From unraveling the mysteries of minuends, subtrahends, and differences to deciphering prices, quantities, and costs, this resource empowers students to conquer complex mathematical scenarios. Elevate your child’s problem-solving skills with engaging and practical examples.. Download for free in PDF.

Content:

Part 1

Addition Problems

Subtraction Problems

Addition and Subtraction Problems

Multiplication Problems

Place Value

Fractions

Decimal Fractions

Comparison

Time and Money

Length and Measurement

Geometry

General Problems

Part 2.

Composite problems on finding the minuend, subtrahend, and difference

Composite problems on finding the price, quantity, and cost

Proportional division problems

Problems on finding the unknown between two differences

Problems on finding the number by a fraction and the fraction by a number

Simple problems on motion

Problems on opposing motion

Problems on motion in one direction

Problems on opposite motion and motion in the reverse direction

Problems on finding the perimeter and area

Review of material studied in grades 1-4

### Text problems on addition.

1. In the library, there are 1030 books. We bought another 67 books for the library. How many books are now in the library?

2. In the art contest, 1085 girls and 531 boys participated. How many students participated in the contest in total?

3. On Friday, Margaret sold 1392 meatballs. On Saturday, she sold 1940 more meatballs than on Friday. How many meatballs did she sell on Saturday?

4. Maya had some stamps. She gave 7 stamps to her younger brothers. Maya then had 14 stamps. How many stamps did Maya have initially?

5. Dad bought two hammers. One costs 18 dollars, and the other is 28 dollars more. What was his total bill?

6. A girl jumps 42 cm for her first high jump in a competition. Her second jump is 46 cm. How high did she jump in total?

7. The computer costs $1709, the printer – $280, and the scanner – $190. What is the total cost of the three items?

8. Lily saved $1620. Polly saved $1923 more than Lily. How much did they save in total?

9. Dan paid $155 for the printer and another $378 for the computer. How much did Dan pay for 2 items in total?

10. This month, Rose has 12 football training sessions. Six sessions during the day and the rest in the morning. How many sessions will be in the morning?

11. Taylor has $23 more than Michelle. If Michelle had $75, how much money do they have together?

12. Jeremy had 17 songs in the playlist, which is fewer than Susanna. If Susanna had 38 songs in the playlist, how many songs do they have altogether?

13. Sally had 18 markers. Jenny had 10 markers, and Mark had 5 markers. They decided to collect their markers and share them equally. How many markers did each student get?

### Word Problems on Subtraction.

1. James and Ken donated $2300 to a charity organization. Ken donated $658. How much did James donate?

2. The price of a car is $2795, and the price of a motorcycle is $1063. What is the difference between the prices of the two vehicles?

3. There are 967 chairs in the hall. During the event, 761 chairs were occupied. How many chairs were unoccupied?

4. Mr. Oliver bought 88 pencils. He sold 26 of them. How many pencils does he have left?

5. There are a total of 98 hats, 20 of them are pink, and the rest are yellow. How many yellow hats are there?

6. A sports club had 2564 members. 130 members left the club after a year. How many new members should the club recruit to have 3000 members?

7. Henry bought a shirt and a tie. The shirt costs $187, and the tie costs $45 less. Find the change Henry received if he paid $200 for the tie.

8. 125 children participated in a math contest. 54 of them were girls. How many more boys were there than girls?

9. Ali collected 127 stamps. He collected 27 stamps less than his sister. How many stamps did they collect in total?

10. Julia has $27 to spend on a trip to the amusement park. If she spends $9.00 on admission, how much money will she have left for food and games?

11. Trevor had 106 figures in his collection. He gave away 12 to a friend who was starting a collection. How many figures does Trevor have left?

12. Selena and Justin started with an equal number of fans. Justin lost 15 fans, and Selena gained 45 more fans. How many more fans did Selena have in the end?

13. The Track Team made 425 grams of candy to sell on Friday. In the morning, they sold 75 grams more candy than during the day. If all the candy was sold, how many grams of candy did the Track Team sell in the morning?

14. The Girl Scout troop had about 350 boxes of cookies that could be bought outside a grocery store. In the morning, they sold 46 more boxes than during the day. If all the cookies were sold, how many boxes of cookies were sold in the morning?

15. Brooklyn scored 27 points in a basketball game. This is 12 points more than her friend Siena. How many points did they score in total?

### Word Problems on Addition and Subtraction.

1. Danny has 40 Starfleet cards. He lost 17 cards in the park. He bought 13 cards in the store. How many cards did Danny have then?

2. Dylan paid $5 for a book. He had $19 left. How much money did Dylan have initially?

3. Sam is reading a book. He read 9 pages yesterday and 5 pages today. If he reads another 12 pages, he will finish the book. How many pages are there in Sam’s book?

4. Toyota’s car factory produces 7736 cars per day. This is 1372 more cars per day than the Honda car factory.

a) How many cars does Honda produce each day?

b) If the Honda factory sells 3459 cars today, how many cars will remain at the Honda factory?

5. 4268 people attend the middle school. It has 768 fewer students than the college.

a) How many students are in college?

b) How many students are there in both schools?

6. “Chicago Tribune” prints 483 newspapers on Tuesday. The newspaper prints 87 fewer newspapers on Thursday.

a) How many newspapers does the newspaper print on Thursday?

b) How many papers does the Chicago Tribune print on both Tuesday and Thursday?

7. In the stationery cabinet, there were 25,473 large paper clips, 13,648 medium paper clips, and 15,306 small paper clips. How many paper clips were in the cabinet?

8. Raffle tickets were sold for a school fundraiser to parents, teachers, and students. 563 tickets were sold to teachers. Students bought 888 tickets more than teachers. 904 tickets were sold to parents.

a) How many tickets were sold to parents, teachers, and students? Round each number to the nearest hundred to find your estimate.

b) How many tickets were exactly sold to parents, teachers, and students?

c) Assess the reasonableness of your answer in (b). Use your estimate from (a) to explain.

9. During March, 68,025 pounds of king crab were caught. If 15,614 pounds were caught in the first week of March, how many pounds were caught in the remaining part of the month?

10. In the stationery cabinet, there were 25,473 large paper clips, 13,648 medium paper clips, and 15,306 small paper clips. How many paper clips were in the cabinet?

11. Trevor had 106 figures in his collection. He gave away 12 to a friend who was starting a collection. How many figures does Trevor have left?

12. Raffle tickets were sold for a school fundraiser to parents, teachers, and students. 563 tickets were sold to teachers. Students bought 888 tickets more than teachers. 904 tickets were sold to parents.

a) How many tickets were sold to parents, teachers, and students? Round each number to the nearest hundred to find your estimate.

b) How many tickets were exactly sold to parents, teachers, and students?

13. Sydney has 7 SpongeBob stickers. She also has 8 Scratch and Sniff stickers. How many stickers does Sydney have in total?

14. Mike had 4 more Halloween treats than Caitlin. If Caitlin had 12 treats, how many treats were there in total?

15. Sarah received 73 votes in the school elections. Ben received 25 votes less than Sarah. How many students voted?

### Word Problems on Multiplication.

1. The store owner bought uniforms for his employees. If each of his three stores needed eight uniforms, how many uniforms would he need in total?

2. John bought two boxes of books at a sale. If each box contained five books, how many books did he buy?

3. A construction worker earns $8 per hour. If he works eight hours a week, how much money will he earn?

4. The pet store sold five hamsters in one week. If each hamster cost eight dollars, how much money did they make?

5. Maggie collects stones by the river. When she finishes, she will find that only 5 stones can fit in the bag. She fills four bags. How many stones does she have in total?

6. Hector has 8 chocolate cookies. Each cookie contains exactly 4 chocolate chips. How many chocolate chips does Hector have in total?

7. Sarah goes to the dog park. She counts 10 dogs in the park. If she wanted to count how many legs the dogs had in total, what would be the numerical sentence? What will be the answer?

8. Scoop cuts 9 pieces of wrapping paper. Each piece of wrapping paper is 7 cm long. What is the total length of the pieces of wrapping paper that Scoop cuts?

9. Gerald had three times more ribbons than Connor. If they had 220 ribbons in total, how many ribbons did Gerald have?

10. A rope with a length of 1530 cm is cut into pieces. The length of one piece is twice the length of the other. What is the length of the longer piece?

11. A piece of fabric with a length of 1640 cm is cut into two parts. The length of one piece is three times the length of the other. What is the length of the longer piece?

Gary is planning a trip to Hong Kong! He found a non-stop flight that lasts for 16 hours. On the way back, all flights have at least one layover. He chooses one that lasts for 19 hours.

How long will Gary be traveling?

Adding Money: Thomas and Matthew are saving money to buy a video game together. Thomas saved $30, and Matthew saved $35. How much money have they saved together?

Subtracting Money: Thomas saved $80. He used his money to buy a video game that costs $67. How much money does he have left?

Multiplying Money: Tim earns $5 for delivering newspapers. How much money will he have after delivering newspapers three times?

Christina went to the park to play with her friends. They played kickball for 40 minutes. Then they went on the swings for 5 minutes before going home.

How long did Christina spend in the park?

185. Solve the problem.

Tom and Bob are brothers, and each of them had the same amount of money that they collected to buy a toy. The cost of the toy was $22. If the cashier gave them change of $6, how much money did each of them have?

182. Solve the problem.

Money Division: Robert spent $184.59 to buy 3 hockey sticks. If each hockey stick had the same price, how much did one cost?

182. Solve the problem.

Adding Money with Decimal Fractions: You went to the store and bought gum for $1.25 and a lollipop for $0.50. What was your total?

182. Solve the problem.

Subtracting Money with Decimal Fractions: You went to the store with $5.50. You bought gum for $1.25, a chocolate bar for $1.15, and a lollipop for $0.50. How much money do you have left?

182. Solve the problem.

Converting Hours to Minutes: Jeremy helped his mom for 1 hour. How many minutes did he help her?

182. Solve the problem.

Applying Proportional Relationships to Money: Jacob wants to invite 20 friends to his birthday party, costing his parents $250. If he decides to invite only 15 friends, how much will it cost his parents? Assume that the relationship is directly proportional.

182. Solve the problem.

Adding Time: If you wake up at 7:00 AM and need 1 hour 30 minutes to get ready and go to school, what time will you arrive at school?

182. Solve the problem.

Subtracting Time: If a train departs at 2:00 PM and arrives at 4:00 PM, how long were the passengers in the train?

182. Solve the problem.

Finding Start and End Time: Rebecca left her father’s store at 7:27 PM. Forty minutes later, she was at home. What time did she arrive home?

### Word Problems on All Operations.

1. Write and perform the following operations:

1) Triple the sum of 1803 and 3448.

2) Reduce the difference of 21004 and 907 by 7 times.

3) Divide the product of 308 and 509 by the quotient of 840 divided by 30.

4) Increase the sum of 1840 and 920 divided by 23 by the product of 1090 and 100.

5) Divide the product of 3774 and 564 by 37 and add 17839 to the quotient.

2. Twenty carpenters and twenty-eight joiners received a total of $13,952 per month. Each joiner received $304. How much did each carpenter receive if they were all paid equally?

3. A factory spent $29,900 on 2 passenger cars and several trucks. A passenger car cost $6200, and a truck was $2700 cheaper. How many trucks were bought?

4. A collective farm bought 5 harvesters and several planters. They paid $5225 in total. A harvester cost $825, and a planter was three times cheaper. How many planters did the collective farm buy?

5. A family traveling to the Far East covered 10,360 km in 4 days. On the first day, they covered one-sixth of the total distance, on the second day – one-fifth of the remaining distance, and on the third day – 199 km more than on the second day. How far did the family travel on the fourth day?

6. In a day, mines extracted 360,000 tons of coal. How many tons of coal will fit into each wagon if 18,000 wagons are needed to transport this coal?

7. The distance between two cities is 9315 km. Two-thirds of this distance the train covered in 138 hours. Then the train speed increased by 7 km. At what speed did the train cover the remaining distance?

8. In three months, a savings bank received deposits amounting to $1,327,480. In the first month, they received one-third of the total amount, and in the second month, two-fifths of the remaining amount. How much was deposited in the third month?

9. After a flood, a river spread to a width of 1980 m. In the first day after the water subsided, the width of the river decreased by one-twelfth, and on the second day, the width of the river decreased by one-sixth of the initial width. What was the width of the river at the end of the second day?

10. A group of tourists covered 1866 km in 4 days. On the first day, they covered one-sixth of the total distance, on the second day – one-fifth of the remaining distance, and on the third day – 199 km more than on the second day. How far did the tourists travel on the fourth day?

11. Each of the three factory buildings needs 1860 kg of coal per day. If 10 kg of coal produces as much heat as 18 kg of peat, how much peat is needed daily if 10 kg of coal produces as much heat as 18 kg of peat?

12. In 8 months, the factory spent 73,640 tons of coal. Five tons of oil produce as much heat as 7 tons of coal. How much oil will be needed instead of coal for the whole year?

13. From a test plot with a length of 40 m and a width of 25 m, they harvested 180 kg of rye. What crop can be expected from 10 hectares?

14. The length of a rectangular piece of land is 300 m, and the width is 102 m. The land accommodates a house, a barn, and an orchard. The length of the house is 25 m, and the width is 14 m. The barn occupies 250 square meters. What is the area of the orchard?

### Compound problems on finding the minuend, subtrahend, and difference

521. 5 children have 10 dollars each. Together, they spent 36 dollars. How much money do they have left?

522. Kolya had 90 rubles. He bought 4 postcards for 12 rubles each. How much money does he have left?

523. When Anya bought 5 T-shirts for 6 euros each, she had 27 euros left. How much money did Anya have initially?

524. Several children had 8 pounds each. They bought a gift for the teacher for 27 pounds, and they had 29 pounds left. How many children were there?

525. Mom had 100 euros. She bought a sweater and gave the remaining money to her 3 daughters, 24 euros each. How much did the sweater cost?

526. Pasha had 85 dollars. After buying several T-shirts for 8 dollars each, he had 37 dollars left. How many T-shirts did Pasha buy?

527. 6 friends had 13 hryvnias each. Together, they spent 54 hryvnias. How much money do they have left?

528. Masha had 67 dollars. She bought 5 souvenirs for 7 dollars each. How much money does she have left?

529. When Asya bought 8 hairbands for 3 euros each, she had 29 euros left. How much money did Asya have initially?

530. Several people had 14 dollars each. They bought a suitcase for 72 dollars, and they had 26 dollars left. How many people were there?

531. Valya had 94 rubles. He bought a magazine, and the remaining money he divided into 3 parts, each of 16 rubles. How much did the magazine cost?

532. Sasha had 74 pounds. After buying several books for 8 pounds each, he had 26 pounds left. How many books did Sasha buy?

533. 7 people had 15 euros each. Together, they spent 66 euros. How much money do they have left?

534. Dasha had 85 euros. She bought 6 toys for 9 euros each. How much money does she have left?

535. When Vasya bought 12 candies for 7 rubles each, he had 28 rubles left. How much money did Vasya have initially?

### Compound problems on finding the price, quantity, and cost

536. Masha bought 8 pens for 12 rubles each and 3 notebooks for 30 rubles each. How much did the entire purchase cost?

537. For 64 rubles, they bought several portions of ice cream, and for another 96 rubles, they bought several portions of Eskimo. How many portions of ice cream did they buy in total if one portion costs 16 rubles?

538. For 81 euros, they bought 27 thick notebooks, and for 64 euros, they bought 16 albums. How much did notebooks and albums cost together?

539. Borya bought 4 boxes of pencils for 2 euros each, 5 packs of markers for 3 euros each, and 9 boxes of paint for 4 euros each. How much did the entire purchase cost?

540. For 49 dollars, they bought several blue T-shirts, and for 63 dollars, they bought several red T-shirts. How many T-shirts did they buy in total if one T-shirt costs 7 dollars?

541. For 98 rubles, they bought 7 buns, and for 96 rubles, they bought 6 patties. How much did the bun and patty cost together?

542. Mitya bought 4 DVDs for 4 dollars each, 6 discs for 5 dollars each, 3 discs for 6 dollars each, and 5 discs for 7 dollars each. How much did the entire purchase cost?

543. For 64 euros, they bought several pots for 8 dollars each, and for 63 dollars, they bought several pans for 7 dollars each. How many pots and pans did they buy in total?

544. For 72 rubles, they bought 9 stickers. Then they bought 6 postcards for 16 rubles each. How many stickers could they buy for the money spent on postcards?

545. Yasha bought several game discs for 6 pounds each and the same number of movie discs for 5 pounds each. How much did Yasha pay for movies if he paid 36 pounds for games?

546. Yura had 132 rubles. He bought 6 stickers for 12 rubles each and several postcards for 15 rubles each. How many postcards did Yura buy?

547. They bought 18 pairs of regular socks for 54 euros. Then they bought 12 pairs of woolen socks for 4 euros each. How many pairs of regular socks could they buy for the money spent on woolen socks?

548. Tolya bought 8 pens at the same price. He paid 60 rubles for blue pens and 36 rubles for black pens. How many blue and black pens did Tolya buy?

549. Marina bought several newspapers for 15 rubles each and the same number of magazines for 35 rubles each. How much did Marina pay for newspapers if she paid 140 rubles for magazines?

550. For 6 blue and 7 black T-shirts, they paid 138 hryvnias. The blue T-shirt cost 9 hryvnias. How much did the black T-shirt cost?

### Problems on proportional division

551. Two people paid 128 hryvnias for roses. How much did each pay if one of them bought 7 roses and the other bought 9 roses?

552. For 84 euros, they bought an equal number of cups and spoons. The cup cost 5 euros, and the spoon cost 2 euros. How many cups and spoons did they buy in total?

553. For 144 rubles, they bought an equal number of envelopes and stickers. The envelope cost 5 rubles, and the sticker cost 7 rubles. How many envelopes and stickers did they buy in total?

554. For 112 rubles, they bought an equal number of wooden and plastic clothespins. The wooden clothespin cost 4 rubles, and the plastic one cost 10 rubles. How much did they pay for wooden clothespins? How much did they pay for plastic ones?

555. For 64 hryvnias, they bought an equal number of pies and buns. The pie cost 3 hryvnias, and the bun cost 5 hryvnias. How much did they pay for pies? How much did they pay for buns?

556. Alyosha and Misha paid 30 hryvnias for several juice packets. Alyosha bought 4 packets, and Misha bought 6 packets. How much did each boy pay?

557. Gosha and Borya paid 90 dollars for toy soldiers. Gosha bought 20 toy soldiers, and Borya bought 25 toy soldiers. How much did each boy pay?

558. For 144 dollars, they bought an equal number of plates and small vases. The plate cost 2 dollars, and the small vase cost 6 dollars. How much did they pay for plates? How much did they pay for small vases?

559. For 98 pounds, they bought an equal number of museum and exhibition tickets. The museum ticket cost 5 pounds, and the exhibition ticket cost 9 pounds. How much did they pay for museum tickets? How much did they pay for exhibition tickets?

560. For 136 rubles, they bought an equal number of matchboxes and lighters. The matchbox cost 7 rubles, and the lighter cost 10 rubles. How much did they pay for matchboxes? How much did they pay for lighters?

561. Dima and Vladik paid 84 rubles for screws. Dima bought 15 screws, and Vladik bought 13 screws. How much did each boy pay?

562. Katya and Sasha paid 162 rubles for hairpins. Katya bought 3 hairpins, and Sasha bought 6 hairpins. How much did each girl pay?

563. Olya and Anya paid 160 rubles for handkerchiefs. Olya bought 7 handkerchiefs, and Anya bought 3 handkerchiefs. How much did each girl pay?

564. For 153 dollars, they bought an equal number of sunflower and olive oil jars. The sunflower oil jar cost 3 dollars, and the olive oil jar cost 6 dollars. How much did they pay for sunflower oil? How much did they pay for olive oil?

565. In one day, the store sold an equal number of cakes and muffins for 132 dollars. The cake cost 7 dollars, and the muffin cost 4 dollars. How much did they earn from cakes? How much did they earn from muffins?

### Problems on finding the unknown by two differences

566. Vitya bought stickers for 72 rubles, and Anton bought them for 90 rubles. Anton bought 3 more stickers than Vitya. How many stickers did each boy buy?

567. Anya bought T-shirts for 35 pounds, and Lena for 15 pounds. Lena bought 4 fewer T-shirts than Anya. How many T-shirts did each girl buy?

568. Zhenya bought pastries for 39 hryvnias, and Stas bought them for 27 hryvnias. Zhenya bought 4 more pastries than Stas. How many pastries did each boy buy?

569. Roma bought buns for 32 rubles, and Kirill for 56 rubles. Kirill bought 3 more buns than Roma. How many buns did each boy buy?

570. Lenya bought toy soldiers for 54 hryvnias, and Yura for 78 hryvnias. Lenya bought 4 fewer toy soldiers than Yura. How many toy soldiers did each boy buy?

571. One piece of fabric is 130 meters, and another is 90 meters of the same fabric. The first piece is 240 dollars more expensive. How much does the whole fabric cost?

572. One bag has 60 kg of apples, and another has 85 kg of the same apples. The first bag is 1750 rubles more expensive. How much do all the bags of apples cost?

573. Nadya bought a watermelon weighing 6 kg, and Olya bought a watermelon weighing 8 kg. Olya’s watermelon is 140 rubles more expensive. How much does each watermelon cost?

574. One barrel has 450 liters of gasoline, and another has 700 liters of gasoline. The first barrel is 7500 rubles cheaper than the second. How much does all the gasoline cost?

575. One package contains 35 identical spoons, and another contains 50 of the same spoons. The second package is 600 rubles more expensive than the first. How much does each package cost?

576. Nadya bought canned fish for 102 hryvnias, and Marina for 78 hryvnias. Marina bought 4 fewer cans than Nadya. How many cans of canned fish did each girl buy?

577. Sveta bought yogurt jars for 270 rubles, and Zhanna for 495 rubles. Sveta bought 5 fewer jars than Zhanna. How many jars of yogurt did each girl buy?

578. Vasya bought gingerbreads for 128 rubles, and Zakhar for 192 rubles. Zakhar bought 4 more gingerbreads than Vasya. How many gingerbreads did each boy buy?

579. Tolya bought notebooks for 168 rubles, and Mitya for 216 rubles. Tolya bought 2 fewer notebooks than Mitya. How many notebooks did each boy buy?

580. Kristina bought rings for 372 rubles, and Inna for 558 rubles. Kristina bought 3 fewer rings than Inna. How many rings did each girl buy?

### Problems on finding the number by the part and the part by the number

581. Vanya has 20 rubles in his right pocket. This is 1/3 of all his money. Vanya spent 1/4 of all his money on buying a notebook. How much did the notebook cost?

582. Lenya had 10 dollars. This is 1/8 of all the money the guys had. The guys spent 1/4 of all their money on buying a gift for their friend. How much did the gift cost?

583. Asya bought a ring for 14 euros. This is 1/6 of all her money. Asya spent 1/10 of the remaining money on a hairpin. How much did the hairpin cost?

584. Dina bought a bun for 12 rubles. This is 1/7 of all her money. Dina spent 1/9 of the remaining money on a cup of tea. How much did the cup of tea cost?

585. Oleg bought a pen for 3 euros. This is 1/16 of all his money. Oleg spent 1/5 of the remaining money on a cinema ticket. How much did the cinema ticket cost?

586. Dima had 25 rubles clenched in his fist. This was 1/3 of all his money. Dima lost 1/15 of all his money. How much money did Dima lose?

587. Gena had 80 dollars. He spent 3/4 of all the money on buying jeans. How much did the jeans cost?

588. Zhenya bought a T-shirt for 7 euros. This is 1/9 of all his money. Lyuba bought a sweater for 19 euros. This is 1/4 of all her money. How much money do Zhenya and Lyuba have left together?

589. Stas had 84 hryvnias. He spent 7/12 of all the money in a cafe. How many hryvnias did Stas spend in the cafe?

590. Senya bought a cinema ticket for 360 rubles. This is 4/9 of all his money. How many rubles did Senya have?

591. Slava had 63 euros. He spent 5/9 of all the money on buying a sweater and 2/7 of all the money on buying a T-shirt. How many euros does Slava have left?

592. Nastya had 40 pounds. She spent 3/8 of all the money on buying books and 2/5 of all the money on buying discs. How many pounds does Nastya have left?

593. Kirill had 112 rubles. He spent 2/7 of all the money on buying a notebook and 3/8 of all the money on buying a notepad. How many rubles does Kirill have left?

594. Natasha has 36 dollars, and Rita has some dollars. The number of Rita’s dollars is 5/9 of Natasha’s dollars. How many dollars do the two girls have in total?

595. The pot costs 400 rubles, and the price of the frying pan is 9/8 of the pot’s price. How much more expensive is the frying pan than the pot?

### Simple problems on motion

596. A car consumes 10 liters of gasoline per 100 km. It traveled for 8 hours at a speed of 50 km/h. How much was spent on gasoline if the gasoline costs 30 rubles per liter?

597. A car consumes 15 liters of gasoline per 100 km. It traveled for 10 hours at a speed of 60 km/h. How much was spent on gasoline if the gasoline costs 30 rubles per liter?

598. A car traveled for 12 hours at a speed of 50 km/h and spent 1440 rubles on gasoline. How much gasoline does the car consume per 100 km if the gasoline costs 20 rubles per liter?

599. A car traveled for 10 hours at a speed of 70 km/h and spent 1960 rubles on gasoline. How much gasoline does the car consume per 100 km if the gasoline costs 20 rubles per liter?

600. A car traveled for several hours at a speed of 60 km/h and spent 312 euros on gasoline. How many hours did the car travel if it consumes 13 liters of gasoline per 100 km and the gasoline costs 2 euros per liter?

601. A car traveled for several hours at a speed of 50 km/h and spent 378 dollars on gasoline. How many hours did the car travel if it consumes 14 liters of gasoline per 100 km and the gasoline costs 3 dollars per liter?

602. A car traveled for 15 hours and spent 192 euros on gasoline. At what speed did the car travel if it consumes 16 liters of gasoline per 100 km and the gasoline costs 2 euros per liter?

603. A car traveled for 25 hours and spent 450 euros on gasoline. At what speed did the car travel if it consumes 15 liters of gasoline per 100 km and the gasoline costs 2 euros per liter?

604. A car traveled for 20 hours at a speed of 60 km/h and spent 5040 rubles on gasoline. How much does the gasoline cost if the car consumes 14 liters per 100 km?

605. A car traveled for 15 hours at a speed of 40 km/h and spent 2160 rubles on gasoline. How much does the gasoline cost if the car consumes 18 liters of gasoline per 100 km?

606. A car consumes 12 liters of gasoline per 100 km. It traveled for 12 hours at a speed of 40 km/h. How much was spent on gasoline if the gasoline costs 20 rubles per liter?

607. A car consumes 16 liters of gasoline per 100 km. It traveled for 9 hours at a speed of 50 km/h. How much was spent on gasoline if the gasoline costs 3 dollars per liter?

608. A car consumes 14 liters of gasoline per 100 km. It traveled for 7 hours at a speed of 60 km/h. How much was spent on gasoline if the gasoline costs 30 rubles per liter?

609. A car consumes 13 liters of gasoline per 100 km. It traveled for 13 hours at a speed of 40 km/h. How much was spent on gasoline if the gasoline costs 20 rubles per liter?

610. A car consumes 11 liters of gasoline per 100 km. It traveled for 11 hours at a speed of 50 km/h. How much was spent on gasoline if the gasoline costs 2 euros per liter?

### Problems on oncoming traffic

611. Two cars simultaneously set off towards each other. Initially, the distance between them was 500 km. The first car was moving at an average speed of 40 km/h, and the second one at an average speed of 60 km/h. The first car consumed 12 liters of gasoline per 100 km, and the second one consumed 14 liters of gasoline per 100 km. How much did each car’s driver spend on gasoline before they met, given that the gasoline costs 20 rubles per liter?

612. Two cars simultaneously set off towards each other. Initially, the distance between them was 800 km. The first car was moving at an average speed of 30 km/h, and the second one at an average speed of 50 km/h. The first car consumed 11 liters of gasoline per 100 km, and the second one consumed 16 liters of gasoline per 100 km. How much did each car’s driver spend on gasoline before they met, given that the gasoline costs 30 rubles per liter?

613. Two cars simultaneously set off towards each other. Initially, the distance between them was 2200 km. The first car was moving at an average speed of 40 km/h, and the second one at an average speed of 70 km/h. The first car consumed 14 liters of gasoline per 100 km, and the second one consumed 18 liters of gasoline per 100 km. How much did each car’s driver spend on gasoline before they met, given that the gasoline costs 3 dollars per liter?

614. Two cars simultaneously set off towards each other. The first car consumed 10 liters of gasoline per 100 km, and the second one consumed 15 liters of gasoline per 100 km. What was the initial distance between them if the driver of the first car spent 72 euros on gasoline, the driver of the second car spent 135 euros on gasoline, and the gasoline costs 3 euros per liter?

615. Two cars simultaneously set off towards each other. The first car consumed 12 liters of gasoline per 100 km, and the second one consumed 13 liters of gasoline per 100 km. What was the initial distance between them if the driver of the first car spent 96 euros on gasoline, the driver of the second car spent 156 euros on gasoline, and the gasoline costs 2 euros per liter?

616. Two cars simultaneously set off towards each other and met in 5 hours. The first car consumed 15 liters of gasoline per 100 km, and the second one consumed 20 liters of gasoline per 100 km. At what speeds were the cars moving if the driver of the first car spent 120 pounds on gasoline, the driver of the second car also spent 120 pounds on gasoline, and the gasoline costs 2 pounds per liter?

617. Two cars simultaneously set off towards each other and met in 10 hours. The first car consumed 12 liters of gasoline per 100 km, and the second one consumed 14 liters of gasoline per 100 km. At what speeds were the cars moving if the driver of the first car spent 1440 rubles on gasoline, the driver of the second car spent 1960 rubles on gasoline, and the gasoline costs 20 rubles per liter?

Here are the English translations for the given problems:

### Problems on Movement in One Direction:

#### Problem 618:

A car left point A for point B. After a few hours, another car left point B for point A, and they met after a few more hours. The first car was moving at a speed of 40 km/h and consumed 13 liters of gasoline per 100 km. The second car was moving at a speed of 45 km/h and consumed 17 liters of gasoline per 100 km. How many hours did each car travel if the driver of the first car spent 312 pounds on gasoline, the driver of the second car spent 306 pounds, and the gasoline cost 2 pounds per liter?

#### Problem 619:

A car left point A for point B. After a few hours, another car left point B for point A, and they met after a few more hours. The first car was moving at an average speed of 50 km/h and consumed 12 liters of gasoline per 100 km. The second car was moving at a speed of 55 km/h and consumed 15 liters of gasoline per 100 km. How many hours did each car travel if the driver of the first car spent 2160 rubles on gasoline, the driver of the second car spent 1980 rubles, and the gasoline cost 30 rubles per liter?

#### Problem 620:

Two cars simultaneously set off towards each other. The initial distance between them was 2200 km. The first car was moving at an average speed of 50 km/h, and the second car was moving at an average speed of 60 km/h. How many liters of gasoline per 100 km did each car consume if the driver of the first car spent 330 euros on gasoline, the driver of the second car spent 648 euros, and the gasoline cost 3 euros per liter?

#### Problem 621:

Two cars simultaneously set off towards each other. The initial distance between them was 1500 km. The first car was moving at an average speed of 40 km/h, and the second car was moving at an average speed of 60 km/h. How many liters of gasoline per 100 km did each car consume if the driver of the first car spent 1560 rubles on gasoline, the driver of the second car spent 3060 rubles, and the gasoline cost 20 rubles per liter?

#### Problem 622:

Two cars simultaneously set off towards each other and met after 10 hours. The first car was moving at an average speed of 50 km/h, and the second car was moving at an average speed of 70 km/h. Each car consumed 14 liters of gasoline per 100 km. How much did one liter of gasoline cost if both drivers spent a total of 5040 rubles?

#### Problem 623:

Two cars simultaneously set off towards each other and met after 14 hours. The first car was moving at an average speed of 40 km/h, and the second car was moving at an average speed of 60 km/h. Each car consumed 16 liters of gasoline per 100 km. How much did one liter of gasoline cost if both drivers spent a total of 672 dollars?

#### Problem 624:

Two cars simultaneously set off towards each other. The initial distance between them was 2600 km. The driver of the second car spent 392 euros on gasoline before the meeting. The first car consumed 12 liters of gasoline per 100 km, and the second car consumed 14 liters of gasoline per 100 km. How much did the driver of the first car spend on gasoline if the cost was 2 euros per liter?

#### Problem 625:

Two cars simultaneously set off towards each other. The initial distance between them was 2100 km. The driver of the second car spent 3840 rubles on gasoline before the meeting. The first car consumed 13 liters of gasoline per 100 km, and the second car consumed 16 liters of gasoline per 100 km. How much did the driver of the first car spend on gasoline if the cost was 20 rubles per liter?

### Problems on Movement in the Same Direction:

#### Problem 626:

A car left point A with a constant speed of 50 km/h. After 2 hours, another car left, following the first at a speed of 70 km/h, and caught up after some hours. The first car consumed 14 liters of gasoline per 100 km, and the second consumed 18 liters per 100 km. How much did the drivers of the first and second cars spend on gasoline before the meeting, considering the cost was 2 euros per liter?

#### Problem 627:

A car left point A with a constant speed of 50 km/h. After 4 hours, another car left, following the first at a speed of 90 km/h, and caught up after some hours. The first car consumed 12 liters of gasoline per 100 km, and the second consumed 20 liters per 100 km. How much did the drivers of the first and second cars spend on gasoline before the meeting, considering the cost was 3 dollars per liter?

#### Problem 628:

A car left point A at a speed of 40 km/h. After 5 hours, another car left, following the first at a constant speed of 60 km/h, and caught up after some hours. The first car consumed 10 liters of gasoline per 100 km, and the second consumed 16 liters per 100 km. How much did the drivers of the first and second cars spend on gasoline before the meeting, considering the cost was 20 rubles per liter?

#### Problem 629:

A car left point A at a speed of 40 km/h. After 1 hour, another car left, following the first at a higher speed and caught up after some hours. The first car consumed 12 liters of gasoline per 100 km. What was the speed of the second car, and how many liters of gasoline per 100 km did it consume if the driver of the first car spent 48 euros on gasoline before the meeting, the driver of the second car spent 56 euros, and the cost was 2 euros per liter?

#### Problem 630:

A car left point A at a speed of 50 km/h. After 2 hours, another car left, following the first at a higher speed and caught up after some hours. The first car consumed 10 liters of gasoline per 100 km. What was the speed of the second car, and how many liters of gasoline per 100 km did it consume if the driver of the first car spent 70 euros on gasoline before the meeting, the driver of the second car spent 84 euros, and the cost was 2 euros per liter?

### Problems on Opposite Movement and Movement in the Opposite Direction:

#### Problem 631:

A car left point A with a speed of 30 km/h. After 10 hours, another car left, following the first at a higher speed, and caught up after some hours. The first car consumed 12 liters of gasoline per 100 km. What was the speed of the second car, and how many liters of gasoline per 100 km did it consume if the driver of the first car spent $144 on gasoline, the driver of the second car spent $180, and the gasoline cost $2 per liter?

#### Problem 632:

A car left point A with a speed of 50 km/h. After 2 hours, another car left, following the first at a speed of 60 km/h, and caught up after some hours. Until the meeting, the driver of the first car spent 1800 rubles on gasoline, the driver of the second car spent 2700 rubles, and the gasoline cost 30 rubles per liter. How many liters of gasoline per 100 km did each car consume?

#### Problem 633:

A car left point A with a speed of 50 km/h. After 4 hours, another car left, following the first at a speed of 90 km/h, and caught up after some hours. The drivers of the first and second cars spent 2160 rubles and 2430 rubles, respectively, on gasoline before the meeting, and the gasoline cost 30 rubles per liter. How many liters of gasoline per 100 km did each car consume?

#### Problem 634:

A car left point A with a speed of 60 km/h. After 5 hours, another car left, following the first at a speed of 90 km/h, and caught up after some hours. The drivers of the first and second cars spent 234 euros and 306 euros, respectively, on gasoline before the meeting, and the gasoline cost 2 euros per liter. How many liters of gasoline per 100 km did each car consume?

#### Problem 635:

A car left point A with a speed of 50 km/h. After some hours, another car left, following the first at a speed of 60 km/h, and caught up after some more hours. The drivers of the first and second cars spent 336 euros and 384 euros, respectively, on gasoline before the meeting. The cars consumed 14 liters and 16 liters of gasoline per 100 km, respectively, and the gasoline cost 2 euros per liter. How many hours did each car travel?

#### Problem 636:

A car left point A with a speed of 40 km/h. After some hours, another car left, following the first at a speed of 60 km/h, and caught up after some more hours. The drivers of the first and second cars spent 192 euros and 288 euros, respectively, on gasoline before the meeting. The cars consumed 8 liters and 12 liters of gasoline per 100 km, respectively, and the gasoline cost 2 euros per liter. How many hours did each car travel?

#### Problem 637:

A car left point A with a speed of 60 km/h. After some hours, another car left, following the first at a speed of 90 km/h, and caught up after some more hours. The drivers of the first and second cars spent 2700 rubles and 2970 rubles, respectively, on gasoline before the meeting. The cars consumed 10 liters and 11 liters of gasoline per 100 km, respectively, and the gasoline cost 30 rubles per liter. How many hours did each car travel?

#### Problem 638:

A car left point A with a speed of 50 km/h. After 4 hours, another car left, following the first at a speed of 70 km/h, and caught up after some more hours. The first car consumed 9 liters of gasoline per 100 km, and the second car consumed 3 liters more. The driver of the second car spent 252 dollars on gasoline before the meeting. How much did one liter of gasoline cost?

#### Problem 639:

A car left point A with a speed of 40 km/h. After 5 hours, another car left, following the first at a speed of 80 km/h, and caught up after some more hours. The first car consumed 8 liters of gasoline per 100 km, and the second car consumed 6 liters more. The driver of the second car spent 1400 rubles on gasoline before the meeting. How much did one liter of gasoline cost?

#### Problem 640:

A car left point A with a speed of 30 km/h. After 10 hours, another car left, following the first at a speed of 50 km/h, and caught up after some more hours. The first car consumed 10 liters of gasoline per 100 km, and the second car consumed 6 liters more. The driver of the second car spent 3360 rubles on gasoline before the meeting. How much did one liter of gasoline cost?

**641.**

Two cars simultaneously left city A in opposite directions with speeds of 40 km/h and 60 km/h. The first car consumed 8 liters of gasoline per 100 km, and the second one consumed 12 liters. The driver of the first car arrived in city B and spent 960 rubles on gasoline, while the driver of the second car arrived in city V and spent 3240 rubles on gasoline. How many hours did each car travel, considering the gasoline price is 30 rubles per liter?

**642.**

Two cars simultaneously left city A in opposite directions with speeds of 50 km/h and 70 km/h. The first car consumed 9 liters of gasoline per 100 km, and the second one consumed 13 liters. The driver of the first car arrived in city B and spent 81 dollars on gasoline, while the driver of the second car arrived in city V and spent 273 dollars on gasoline. How many hours did each car travel, considering the gasoline price is 3 dollars per liter?

**643.**

Two cars simultaneously left point A in opposite directions, traveled for 5 hours, and simultaneously stopped. The first car consumed 12 liters of gasoline per 100 km, and the second one consumed 14 liters. The driver of the first car spent 672 rubles on gasoline, while the driver of the second car spent 1176 rubles. Find the speeds of both cars, considering the gasoline price is 28 rubles per liter.

**644.**

Two cars simultaneously left point A in opposite directions, traveled for 10 hours, and simultaneously stopped. The first car consumed 9 liters of gasoline per 100 km, and the second one consumed 15 liters. The driver of the first car spent 1305 rubles on gasoline, while the driver of the second car spent 3045 rubles. Find the speeds of both cars, considering the gasoline price is 29 rubles per liter.

**645.**

Two cars simultaneously left point A in opposite directions, traveled for 15 hours, and simultaneously stopped. The first car traveled at a speed of 40 km/h, and the second one at a speed of 60 km/h. The driver of the first car spent 108 euros on gasoline, while the driver of the second car spent 198 euros. Find the liters of gasoline per 100 km for each car, considering the gasoline price is 2 euros per liter.

**646.**

Two cars simultaneously left point A in opposite directions, traveled for 10 hours, and simultaneously stopped. The first car traveled at a speed of 30 km/h, and the second one at a speed of 70 km/h. The driver of the first car spent 588 rubles on gasoline, while the driver of the second car spent 2548 rubles. Find the liters of gasoline per 100 km for each car, considering the gasoline price is 28 rubles per liter.

**647.**

Two cars simultaneously left city A in opposite directions with speeds of 60 km/h and 50 km/h, traveled for different times, and stopped. The first car consumed 10 liters of gasoline per 100 km, and the second one consumed 12 liters. The driver of the first car spent 870 rubles on gasoline, while the driver of the second car spent 1392 rubles. Find the distance between the cars and the time each car traveled, considering the gasoline price is 29 rubles per liter.

**648.**

Two cars simultaneously left city A in opposite directions with speeds of 50 km/h and 70 km/h, traveled for different times, and stopped. The first car consumed 9 liters of gasoline per 100 km, and the second one consumed 14 liters. The driver of the first car spent 756 rubles on gasoline, while the driver of the second car spent 2744 rubles. Find the distance between the cars and the time each car traveled, considering the gasoline price is 28 rubles per liter.

**649.**

A car left city A, traveled for 10 hours to city B, then turned around and traveled back for 4 hours at the same speed. To return to city A, the driver needs to spend more on gasoline. The car consumes 9 liters of gasoline per 100 km, the driver has already spent 1890 rubles, and the gasoline costs 30 rubles per liter. How much more does the driver need to spend on gasoline?

**650.**

A car left city A, traveled for 15 hours to city B, then turned around and traveled back for 5 hours at the same speed. To return to city A, the driver needs to spend more on gasoline. The car consumes 12 liters of gasoline per 100 km, the driver has already spent 432 dollars, and the gasoline costs 3 dollars per liter. How much more does the driver need to spend on gasoline?

**651.**

A car left city A, traveled for 20 hours to city B, then turned around and traveled back for 5 hours at the same speed. To return to city A, the driver needs to spend more on gasoline. The car consumes 8 liters of gasoline per 100 km, the driver has already spent 2240 rubles, and the gasoline costs 28 rubles per liter. How much more does the driver need to spend on gasoline?

**652.**

A car left city A, traveled for 12 hours to city B, then turned around and traveled back for 4 hours at the same speed. To return to city A, the driver needs to spend 1200 rubles more on gasoline. The car consumes 10 liters of gasoline per 100 km, and the gasoline costs 30 rubles per liter. How much has the driver already spent on gasoline?

**653.**

A car left city A, traveled for 15 hours to city B, then turned around and traveled back for 10 hours at the same speed. To return to city A, the driver needs to spend 1218 rubles more on gasoline. The car consumes 14 liters of gasoline per 100 km, and the gasoline costs 29 rubles per liter. How much has the driver already spent on gasoline?

**654.**

A car left city A, traveled for 14 hours to city B at a speed of 50 km/h, then turned around and traveled back for 5 hours at a different speed. To return to city A, the driver needs to spend 72 euros more. The car consumes 9 liters of gasoline per 100 km, and the gasoline costs 2 euros per liter. At what speed did the car travel back?

**655.**

A car left city A, traveled for 20 hours to city B at a speed of 70 km/h, then turned around and traveled back for 8 hours at a different speed. To return to city A, the driver needs to spend 3080 rubles more. The car consumes 11 liters of gasoline per 100 km, and the gasoline costs 28 rubles per liter. At what speed did the car travel back?

**656.**

A sports field with a length of 30 m and a width of 10 m was fenced with a fence. 1 m of the fence costs 200 rubles. How much did it cost to fence the entire field?

**657.**

A frame for a picture with a width of 120 cm and

a height of 70 cm was decorated with a gold ribbon around the perimeter. The price of 1 cm of the ribbon is 3 rubles. How much did the entire ribbon cost?

**658.**

A plot with a length of 70 m and a width of 50 m was fenced with a fence. In this case, slats were used – one row at the top, one at the bottom. 1 m of slats cost 20 rubles. How much did the slats for the entire fence cost?

**659.**

Around a plot with a length of 80 m and a width of 40 m, a fence was made of barbed wire, stretched around the perimeter 5 times. The entire wire cost 12,000 rubles. How much did 1 m of the wire cost?

**660.**

Around a garden with a length of 40 m, a ditch was dug. Digging 1 m of the ditch cost 100 rubles. The entire ditch cost 13,000 rubles. Find the width of the garden.

Here are the English translations for the problems:

660. Around the garden with a length of 40 m, a ditch was dug. Excavating 1 m of the ditch cost 100 rubles. They paid 13,000 rubles for the entire ditch. Find the width of the garden.

661. A room with a width of 5 m along the floor and ceiling edges was trimmed with a skirting board. 1 m of the skirting board cost 80 rubles. They paid 4160 rubles for the entire skirting board. Find the length of the room.

662. 4 identical halls with a length of 20 m were decorated with a luminous garland around the perimeter. 1 m of the garland cost 120 rubles. They paid 31,680 rubles for the entire garland for the 4 halls. Find the width of the hall.

663. The corridor was covered with linoleum. They paid 5400 rubles for the linoleum. The length of the corridor is 9 m. Find the width of the corridor if 1 m^{2} of linoleum cost 150 rubles.

664. The room was covered with carpet. They paid 2310 rubles for the carpet. The width of the room is 5 m. Find the length of the room if 1 m^{2} of carpet cost 66 rubles.

665. The wall was covered with wallpaper. They paid 6300 rubles for the wallpaper. The length of the wall is 6 m, and the height is 3 m. How much did 1 m^{2} of wallpaper cost?

666. The wall was paneled with lining. They paid 18,200 rubles for the lining. The length of the wall is 7 m, and the height is 4 m. How much did 1 m^{2} of lining cost?

667. Half of the room was covered with carpet, and half with linoleum. They paid 1440 2 rubles for the carpet. How much did they pay for the linoleum if 1 m of carpet cost 80 rubles and 1 m^{2} of linoleum cost 400 rubles?

668. A third of the wall was paneled with lining, and the rest was covered with wallpaper. They paid 6400 rubles for the lining. How much did they pay for the wallpaper if 1 m^{2} of lining cost 800 rubles, and 1 m^{2} of wallpaper cost 250 rubles?

669. The roof, with a length of 12 m and a width of 8 m, was covered with iron sheets. 1 m^{2} of iron sheet cost 900 rubles. How much did they pay for all the sheets?

670. The lid of the chest, with a length of 16 dm and a width of 6 dm, was covered with inlay. How much did they pay for the entire inlay if 1 cm^{2} of inlay cost 4 rubles?

### Review of studied material in grades 1-4

671. In the 19th century, a civil servant received a salary of 1200 rubles per year and spent 65 rubles per month. After 4 years, he bought 35 desyatins of land with his savings. How much did one desyatina of land cost?

672. In the fuel tank of the “Zhiguli” car, 36 liters of gasoline were poured, and in the “Volga” tank, 64 liters. They paid 600 rubles for the entire gasoline. How much did they pay for the gasoline for each car?

673. The older brother saved 500 euros each year for 5 years, and the younger one saved 250 euros each year for 6 years. With this money, they bought 80 sotkas of land. How many sotkas of land did each buy?

674. A wealthy Mexican living in the 13th century bought two boats on one day and five boats on another day. He paid with cocoa beans for the purchase. On the second day, he paid 300 kg more beans than on the first day. How many kilograms of cocoa beans did the Mexican give for all the boats?

675. For 12 rubles, they bought 3 pieces of calico of the same length. The arshin of the first piece cost 24 kopecks, the second – 20 kopecks, and the third – 16 kopecks. How many arshins are in each piece?

676. Two workers received a total of 40,000 rubles for their work. One worked for 4 days, 7 hours each day, and the other worked for 9 days, 8 hours each day. How much money should each receive?

677. In the 19th century, a civil servant received 1000 rubles per year and spent 70 rubles per month. After how many years will he pay off a debt of 800 rubles?

678. In the editorial office, 15 letters are received per week. The price of a stamp for an envelope is 7 rubles. How much money is spent on stamps per year?

679. In the 19th century, an ordinary civil servant received 500 rubles per year. One civil servant spent 45 rubles in the first 7 months of the year. How much could the civil servant spend in each of the remaining months?

680. In the 19th century, one civil servant saved 31 rubles and 25 kopecks from his salary each month. Finally, he bought 48 desyatins of land for the saved money, at 48 rubles per desyatina, and 29 desyatins of land at 24 rubles per desyatina. How many years did the civil servant save money?

681. In the 19th century, one worker spent 80 kopecks on himself every

day, earning 1 ruble 60 kopecks a day. He sent 9 rubles to his wife in the village each month. How many working days in the year (non-leap) did this worker have?

682. In the 19th century, in one hotel, they fed 17 people for 5 days, and the owner spent 21 rubles and 25 kopecks on food. How much money is needed to feed 19 people for 7 days?

683. In the 19th century, one could buy 64 pins for one kopeck. How many pins could you buy for 156 rubles and 25 kopecks?

684. They bought 15 boxes of sugar, and they lasted for 3 years (non-leap). How many days did one box of sugar last?

685. In the 19th century, a city dweller needed 17 rubles and 1 kopeck for food for a week. How much money did the city dweller spend per day?

686. In the 19th century, one civil servant had a salary of 37 rubles and 50 kopecks per month. One civil servant served for 8 months. How much money did the civil servant receive during this time?

687. The car “Zhiguli 2107” consumes 8 liters of gasoline per 100 km. How much will a trip from Moscow to Vologda and back cost if 1 liter of gasoline costs 6 rubles and 10 kopecks, and the distance between cities is 500 km?

688. The command of the Russian fleet bought 250 torpedoes from Austria, paying 1,000,000 rubles. How many Russian torpedoes could they buy for this money if the Russian torpedo is 1000 rubles cheaper than the Austrian one?

689. In some African tribes, cowrie shells were used as money. A peasant from the Ibo tribe bought 2 axes for 300 cowries each at the market, material for a dress for his wife for 400 cowries, and 2 pieces of European soap. How much did a piece of soap cost if the peasant spent 1100 cowries on all purchases?

690. In Sweden, two drivers bought 15 liters of gasoline at the same price. One paid 80 kronor, and the other paid 40 kronor. How many liters did each driver buy?

691. In Finland, 1 liter of gasoline costs 5 marks. How many liters can 2 drivers buy together if one has 23 marks and the other has 12 marks?

692. In Finland, children bought 2 packs of kiwi candies for 24 marks each and several packs of chewing gum for 13 marks each. How many packs of chewing gum did they buy if the entire purchase cost 87 marks?

693. In Denmark, Alice and Oleg bought 3 packs of orange candies and 4 packs of lemon candies at the same price. They paid 36 crowns for the orange candies. How much money did the children pay for the lemon candies?

694. They paid 100 rubles for 16 meters of ribbon. How much does one meter of ribbon cost?

695. Mom bought 120 plastic lids. This purchase cost her 150 rubles. How much does one lid cost?

Here are the English translations for the additional problems:

696. In the 11th century in Rus, there were various fines for poaching. The price of a cow was 3 grivnas, and the fine for killing a beaver was 4 times more expensive. A beaver hunter was fined 36 grivnas. How many beavers did he kill?

697. Someone spends 40 rubles per day. How much money does he spend in a year (non-leap)?

698. In two pieces of identical calico, there are 50 arshins. One is 6 arshins longer and 90 kopecks more expensive than the other. How much does each piece cost?

699. In the store, there were 240 kg of tea with a total cost of 600 euros. On the first day, they sold 2/3 of all tea, on the second day – 48 kg, on the third day – the remaining tea. How much was the tea sold for on the third day?

700. In Ancient Rome, a noble citizen bought the down of German geese for five pillows for himself and three pillows for his wife. He paid 80 sesterces^{1} more for the down for his pillows. How much did the entire purchase cost?

701. For a noble citizen in Ancient Rome, 2 pillows were made. One pillow took 3 asses of down, and the other took 5 asses of down (1 as = 327 g). They paid 40 sesterces more for the down for the second pillow. How much did the down cost for each pillow?

1

Sesterces – Ancient Roman silver coin.

702. For the office, they bought n tables at р rubles each and k chairs. They paid х rubles for the entire purchase. How much did one chair cost?

703. Two companies bought h apartments at the same price. One company paid c rubles for the apartments, and the other paid d rubles. How many apartments did each company buy?

704. A plot with a length of 20 m and a width of 10 m was fenced with a mesh. 1 m of the mesh costs 150 rubles. How much did they pay for the mesh?

705. Around the perimeter of a square room with an area of 81 m^{2}, a skirting board was laid. 1 m of skirting board costs 60 rubles. How much money was spent on the skirting board?

706. Two seamstresses bought 20 m of fabric at the same price. One paid 200 rubles for the fabric, and the other paid 600 rubles. How many meters of fabric did each seamstress buy?

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