Open math problem one

Grade one and grade five 192, among which 32 are "three good". What percentage of the fifth-grade students are "three good"?

application problem

Xinhua Bookstore delivered a batch of sci-tech books, and sold 300 books on the first day, accounting for 30% of this batch of books. How many science and technology books are there in this batch?

There are 280 students in Grade Three and Grade Five, of whom 50% are boys. How many boys are there in grade five?

There are 300 students in the fourth and sixth grades, twice as many as in the third grade. There are fewer 10 students. How many students are there in the third grade?

There are 60 boxes of apples in the fruit shop, which is three times as much as oranges, which is 10 more boxes. How many boxes of oranges are there in the fruit shop?

Grade one and grade five 192, among which 32 are "three good". What percentage of the fifth-grade students are "three good"?

application problem

Xinhua Bookstore delivered a batch of sci-tech books, and sold 300 books on the first day, accounting for 30% of this batch of books. How many science and technology books are there in this batch?

There are 280 students in Grade Three and Grade Five, of whom 50% are boys. How many boys are there in grade five?

There are 300 students in the fourth and sixth grades, twice as many as in the third grade. There are fewer 10 students. How many students are there in the third grade?

There are 60 boxes of apples in the fruit shop, which is three times as much as oranges, which is 10 more boxes. How many boxes of oranges are there in the fruit shop?

18. It is known that an iron bridge is 1000 meters long, and a train passes on the bridge. According to the measurement, it takes 1 minute for the train to get on the bridge, and it takes 40 seconds for the whole train to completely cross the bridge. Find the length and speed of the train.

19. A woman is washing dishes by the river. People saw her and asked her why she used so many bowls. She replied that there were many guests at home. They share a dish bowl for every two people, a soup bowl for every three people, and a rice bowl for every four people, and * * * used 65 bowls. How many guests are there in her house?

20. Xiaoming has a packet of biscuits, and the number of four, five and six is more than one. How many biscuits does Xiaoming have in this bag?

1. Xiaoming reads a book. He originally planned to read 35 pages a day and finish it in 32 days. As a matter of fact, I read five more pages than planned every day. How many days did it actually take to read it?

2. build a road. It was originally planned to build 0.4 kilometers a day, which can be completed in 70 days. The actual number of meters repaired every day is 1.25 times as planned. How many days will it actually take to complete?

3. The greening team plans to plant trees and complete the task in 8 days. Actually, 240 trees were planted every day, and all the tree planting tasks were completed in 7 days. How many more trees are actually planted every day than planned?

4. A neighborhood committee expressed condolences to the families of martyrs and sent them brown sugar and white sugar. 2 bags of brown sugar and 5 bags of white sugar were distributed to every household. When they delivered it to the last household, the brown sugar had just arrived, and there were 10 bags of white sugar left. It is known that the number of bags of white sugar is three times that of brown sugar, so how many bags of brown sugar and white sugar do you bring?

The clothing factory has to process a batch of clothes. The first workshop and the second workshop were processed at the same time for 60 days, which has just been completed. It is known that the clothing processed in the first workshop accounts for 45% of the total clothing, and the second workshop processes 132 pieces every day. How many pieces are processed in the first workshop every day?

The washing machine factory plans to produce a batch of washing machines. Results 37.5% of the plan was completed in 9 days. According to this calculation, how many days will it take to complete the plan?

7. There is a pile of coal that can be burned 120 days. Due to the improvement of coal-burning technology, 0.25 tons of coal was saved every day, and as a result, this pile of coal burned 150 days. How many tons is this pile of coal?

8. Take seven yellow cattle and put them among the buffaloes, so that the number of the three groups of cattle is exactly the same. How many cows are there?

9. Workshop A and Workshop B process a batch of the same parts. If workshop A processes 35 pieces first, then workshop B processes 1 day first, and then workshop B starts processing again. After 5 days, the number of parts processed by the two workshops is equal. So how many parts does workshop B process in a day?

12. Grass100kg, with water content of 66%. After drying, the water content decreased to 65438 05%. How many kilograms do these grasses weigh after drying?

13. Reduce one side of the square by 1/5 and increase the other side by 4 meters to get a rectangle. This rectangle has the same area as the original square. So how many square meters is the square area?

14. A workshop processes A and B parts. Part a accounts for 30% of the processing part, and then 24 parts b are processed, at which time part a accounts for 25%. So how many two kinds of parts have been processed now?

15. Party A, Party B and Party C * * * produced 1760 pieces. If Party A produces 2/9 less and Party B produces 80 more, then the number of parts produced by Party A, Party B and Party C is equal. How much did A, B and C each produce?

16. Xiaoming's age this year is 65438+ 0/6 of his father's age. 15, his age is 4/9 of his father's age. How old are Xiaoming and his father this year?

17. There are 3 14 students in a school, of which 2/3 boys are 40 less than 4/5 girls. How many boys and girls are there in this school?

18. Class A and Class B have the same number of students, and some students in each class participated in the math group. The number of people in class A who participated in the math group was exactly1/3 of the number of people in class B who did not participate in the math group; The number of people who participated in the math group in Class B is exactly 0.4 of the number of people who did not participate in the math group in Class A+65438+A ... So, how many people who did not participate in the math group in Class A are from Class B?

19. There are several liters of alcohol solution in the container. After adding 1 liter of water, the pure alcohol content is 25%; Add 1 liter of pure alcohol, and the content of pure alcohol in the container is 40%. So how many liters of alcohol solution were there in the original container? What is the concentration?

20. Party A, Party B and Party C can finish copying a manuscript within 1 hour. If Party A and Party B copy together, it will take 80 minutes to complete; If B and C are copied together, it will take 100 minutes to complete. If this manuscript is copied by B alone, how many hours will it take to finish?

2 1. A single project can be completed in 20 days; B alone can be completed in 30 days. Now working together, the middle one rested for 3 days, and the second one rested for several days. It took 16 days to complete. B how many days did you rest?

22. It takes 8 hours to fill a pool of water and only open one pipe; It takes 12 hours to open only the second pipe; It takes 15 hours to open only the C tube. Starting today, only two pipelines A and B were opened, then two pipelines A and B were closed in the middle, and then pipeline C was opened. It takes 65,438+00 hours to fill a pool of water. So how many hours does it take to open the C pipe and inject water?

23. It takes 12 days for an engineering team to undertake a project. If only two teams, A and B, are allowed to exchange work contents, the whole project will be delayed for three days. If the two teams A and B are allowed to exchange work contents, and the two teams C and D are also allowed to exchange work contents, then the whole project can still be completed as scheduled. If only C and D teams are allowed to exchange work contents, the whole project can be completed a few days in advance.

24. Team A and Team B cooperate on a project. After team A worked alone for 6 days, team B joined in and worked with team A, and it took another 4 days to complete 1/3 of the whole project. After another 10 day, the whole project was completed by 3/4. Because group A has another task, group B will continue to work until the whole project is completed. How many days did it take from the beginning to the end?

25. Party A and Party B leave from A and B at the same time and go to B and A respectively, with the speed ratio of 7: 6. After they met, they moved on, and then B's speed increased every hour compared with the initial speed.

1. Two teams mow grass, each team cuts 3 bundles, each bundle weighs 8 kg. How many kilograms has a * * * lost?

2. Zhangjiazhuang Primary School has built 9 new classrooms, each with 6 windows, each with 8 pieces of glass. How many pieces of glass do you need to install a * * *?

3. Each bookshelf has five floors, and each floor has 30 books. How many books are put in three bookshelves?

The school held a broadcast gymnastics performance. There are 3 classes in Grade Three, Grade Four and Grade Five, each class has 16 students. How many people are there in the performance?

Continuous division of application problems (two solutions)

1. Seven boxes of thermos cups were sold in the store, each box was 12, and the income from one * * * was 336 yuan. How much is each thermos?

2. There are two classes in Grade Three, each class has 43 people, and each class has 258 trees. How many trees are planted in each class on average?

3. 100 The loan shop sold 3 boxes of gyroscopes, each containing 20 pieces. A * * * sold to 720 yuan. What is the price of each coat?

4. The school bought prizes for miyoshi students, two boxes of pens, one for each box 10 and one for 80 yuan. How much is each pen?

The answer should be this:

30.8÷[ 14-(9.85+ 1.07)]

[60-(9.5+28.9)]÷0. 18

2.88 1÷0.43-0.24×3.5

20×[(2.44- 1.8)÷0.4+0. 15]

28-(3.4+ 1.25×2.4)

2.55×7. 1+2.45×7. 1