2. Xiaohong weighs 42kg, Xiaoyun weighs 40kg, and Xiao Xin's weight is equivalent to the sum of Xiaohong's and Xiaoyun's. How much does Xiao Xin weigh
3. The fifth-grade students collected 42 kilograms of tree species, and the fourth-grade students collected less than the fifth-grade students. How many kilograms of tree species are collected less in the fourth grade than in the fifth grade? How many kilograms of tree species were collected in the fourth grade?
4. There are 128 students in the fifth grade of Guangxin Primary School who have reached the standard of physical exercise. The "qualified" students are girls, and the "qualified" boys account for a few points of the total number of fifth-grade students?
5. In the fifth grade, 36 people participated in the math group, the number of Chinese group belongs to the math group, and the number of sports group belongs to the Chinese group. How many people are there in the sports team? (Tell me who is regarded as the unit "1" in each step of calculation. )
6. The typist types a manuscript every day and finishes it. How many parts of the book did they finish in five days?
7. The school canteen used 640 tons of water in September. The planned water consumption in September was 10, but the actual water consumption in September was less than originally planned. How many tons of water was saved in 10 compared with the original plan?
8. There is a sheet piling with * * * 120. First use, second use. How many times has this stack of paper been used? How many sheets of paper have you used twice?
9. Insects often flap their wings when flying. Grasshoppers can vibrate their wings 18 times per second, and bees can vibrate their wings 236 times per second.
(1) How many times do locusts flap their wings per second than bees?
(2) How many times do bees flap their wings per second than locusts?
10. Students from three classes in Grade Five help the library to make up books. Class one has repaired 54 books, while Class two has repaired 54 books.
Class three repairs twice as much as class two. How many repair books are there in Class Three?
1 1, (1) The length of a steel pipe12m, cut off by 8m. What percentage of the total length was cut off? What is the remaining total length?
(2) Steel pipe length12m. If the rice is cut, how much rice is left?
(3) The length of a steel pipe is12m. If it is cut off, how many meters are left?
(4) Cut off the full-length steel pipe and there are still 3 meters left. How long is this steel pipe?
12, hongxing primary school 10, the water fee in October was 204 yuan, less than that in September. Pay more to 40 yuan in September than in August. How much is the water fee in August?
13, the delivery car from A to B, with a speed of 45 kilometers per hour, will be delivered every hour. How many hours will it take to get back at the same speed?
14. The price of a set of tables and chairs is 60 yuan, and the price of chairs is the desk. What's the price of this chair?
15, a nursery for cultivating seedlings. Pine seedlings cover 5 hectares, and cypress seedlings are less hectares than pine seedlings. These two kinds of saplings occupy the whole nursery. How many hectares of land does this nursery have?
16, Yimin food factory produced 3 tons of children's biscuits, which exceeded the juice biscuits. How many tons of two kinds of biscuits did a * * produce?
17. It takes 6 hours for Party A to do a job alone, and 4 hours for Party B to do a job alone. After finishing, two people work together. How many hours will it take to complete?
18. A train went from Station A to bilibili ... I covered 480 kilometers in 6 hours. At this rate, how many hours will it take to get to bilibili?
19. There are two goldfish bowls. If you take 15 tails out of the first tank and put them in the second tank, the goldfish in the second tank happens to belong to the first tank. It is known that there are 35 goldfish in the second tank. How many goldfish are there in the first tank than in the second tank?
20. An engineering team built a section of road. This road was built in the first week and in the second week. The first week is 2 kilometers longer than the second. How many kilometers is this road?