2. Build a 200-meter-long canal, which has been built for 80 meters. How many meters will it take to repair three-fifths of the canal?
3. A book has 600 pages. I saw 1/4 on the first day and 2/5 on the second day. How many pages have I read in two days?
Ada Garden Primary School donated money to Hope Project. Class 6 (1) donated 1/3 for the sixth grade, and 1/4 for the whole school for the sixth grade. The whole school donated 2400 yuan. How much did Class 6 (1) donate? (Answer in two ways)
5. The distance between Party A and Party B is 60km, and the car goes from Party A to Party B. When the car exceeds the midpoint of the whole journey10km, what fraction of the whole journey remains?
Last year, the school planted 120 trees. This year, there are 5 more trees than last year's 3/4. How many trees will be planted this year?
7. The school planted 120 trees this year, 5/3 more than last year. How many trees were planted last year?
8. A basket of apples was sold in half for the first time and 4/5 for the second time. How many apples have not been sold in this basket?
9. A table tennis ball falls from a height of 25 meters, and the height of each rebound is 2/5 of the falling height. How many meters can you bounce back after the fourth fall?
10. A batch of garment processing tasks are allocated to workshops A and B according to the ratio of 4: 5. Workshop A actually produced 450 units, which exceeded the assigned task of 1/4. How many sets of clothes are there?
1 1. In July of a certain year, rainy days were 2/3 of sunny days and cloudy days were 2/5 of sunny days. How many days are there sunny this month?
12. The shopping mall * * *1380m has white cloth, blue cloth and printed cloth. The rice ratio of white cloth to printed cloth is 5: 6, and the rice of printed cloth is 3/2 times that of blue cloth. How many meters are there in each of the three fabrics?
13, three groups of students collect tree species, and the working efficiency ratio of group A, group B and group C is 5∶3∶4. Group A received 15 Jin, but how much Jin did Group B receive less than Group C?
14, number A is 3/5 of number B, number C is 2/3 of number A, and number C is a fraction of number B?
15, each tractor plows 5/7 hectares per hour, and how many hectares does 8 tractors plow in 45 minutes?
16, a rope, cut its 1/2 for the first time, the remaining 1/3 for the second time, and the remaining 1/4 for the third time. How much rope is left?
17. The proportion of cement, yellow sand and gravel in concrete is 2: 3: 5. If there are 3/4 tons of cement mixed with concrete, how many tons of yellow sand gravel are needed?
18, Xiaohong finished reading 2/5 of a book in 8 days, and prepared to finish reading the rest in 6 days. How many points does she read this book on average every day?
19, a book with 640 pages, I read 3/8 in three days. How many days does it take to finish reading this book at this speed?
On an 800-kilometer road, a car covered three-fifths of the distance in six hours. How many hours does it take to complete the race at this speed?
2 1, Xiaohong took out 4/7 of the money herself, Xiaoli took out 3/5 of the money herself, and they bought the same dictionary. It is known that Xiaohong originally had 2 1 yuan, so how much did Xiaoli want?
22. There is a batch of chemical fertilizers in the warehouse, and 4/7 of them are distributed to Wangcun and Zhang Cun according to the ratio of 5: 3. It is known that Zhang Cun is 4.8 tons less than Wangcun. How many tons is this batch of fertilizer?
23. The number of girls in Class 1 (2) of Xinhekou Primary School accounts for 5/6 of the number of boys. After transferring two girls, there are still 42 students in the class. What is the ratio of girls to boys now?
In a math exam, the average score was 78. It is known that the average score of boys is 75.5 and that of girls is 8 1. What is the ratio of boys to girls in this class?
25. A glass of salt water is 200g, and the ratio of salt to water is 1: 24. If you add another 4 grams of salt, what is the ratio of salt to water?
26. A factory 120 people, and B factory 80 people. How many people are transferred from Factory B to Factory A, so that the ratio of the two factories can reach 5∶3?
27. A canal with a length of 1.800 meters was built. After five days of work, the ratio of the repaired length to the unrepaired length was 1∶3. According to this schedule, how many days will it take for the canal to be completed?
28. The speed ratio of car to truck is 4: 7. Two cars driving from two places at the same time meet at the midpoint15km. How many kilometers did the train travel at this time?
29. An airplane flies 720 kilometers per hour, and it takes 3/4 hours to cover 2/7 of the whole journey. How many kilometers is the whole journey?
30. Master Wang processes a batch of parts in 6/7 hours 12 pieces. According to this calculation, how many hours will it take to process 144 parts?