2. Two construction teams, Party A and Party B, will excavate a tunnel with a length of 126 meters, and the two teams will carry out construction from both ends. Team A digs 4 meters every day, while Team B digs 3 meters every day. How many days does it take to dig the tunnel?
3. There are 140 students in the school music group and art group. The number of people in the music group is six times that in the art group. How many people are there in the art group?
4. The two brothers walked from home to the gymnasium at the same time, with a length of 1300m. My brother walks 80 meters per minute. My brother rides his bike to the gym at a speed of 180 meters per minute and will be right back. On the way, he met his brother, and then he walked for a few minutes.
On Children's Day, Mr. Wang bought 1 17 fruit and made a beautiful gift package. Each child got three kinds of fruits. How many children can these fruits give?
6. The coal yard delivered 1 1.5 tons of coal in the morning, and some more in the afternoon. One day, * * * shipped 24.3 tons of coal, how many tons in the afternoon?
7. The sum of three consecutive odd numbers is 57. What's the middle number?
8. The piano has 48 black keys, 26 less than the white keys. How many white keys are there?
9. It takes 4 hours for a car to travel from A to B to reach its destination. It is known that the distance between the two places is128km. How many kilometers does this car travel per hour?
10, the circumference of the rectangle is 9.8 cm, and the known length is 3 cm. How many centimeters is the width of this rectangle?
1 1. If a school wants to transport 29.5 tons of coal, it should be transported three times by a 4-ton truck and the rest by a 2.5-ton truck. How many times will it take to complete?
12. The trapezoidal site covers an area of 90 square meters, with an upper floor of 7 meters and a lower floor of 1 1 meter. How high is it?
13. Miss Li has money from 50 yuan. He bought 10 exercise books, each 0.5 yuan, and then bought 15 pens. How much is each pen?
14. A workshop originally planned to produce 1290 pieces in May. It has been produced for 7 days, and 240 more will complete the production plan. How many pieces will be produced every day in these seven days?
15, two cars, Party A and Party B, travel in opposite directions at the same time from two places 272km apart. After 3 hours, the distance between the two cars is still 17km. A travels 45 kilometers per hour, and B travels how many kilometers per hour?
16, two classes in grade six in a school, with an average score of 85 in mathematics last semester. There are 40 students in six classes (1) with an average score of 87. 1. There are 42 students in Class Six (2). What is the average score?
17. The school bought 10 boxes of chalk. 250 boxes were used, and there are 550 boxes left. How many boxes are there in each box on average?
/kloc-Grade 0/8, Grade 4 * * 200 students. During extracurricular activities, 80 girls went to jump rope. The boys are divided into five groups to play football. How many people are in each group?
19. The canteen delivered 150 kg of rice, which was 30 kg less than the flour delivered. How many kilograms of flour does the canteen send?
There are 52 peach trees and 6 rows of pear trees in the orchard. There are 20 more pear trees than peach trees. How many pear trees are there in each row on average?
2 1, Li Shifu bought 72 meters of cloth, just to make 20 clothes for adults and 16 clothes for children. Adult dresses are 2.4 meters each, and how many meters are children's dresses?
Two or three years ago, my mother was six times older than my daughter. This year, my mother is 33 years old. How old is my daughter?
23. How long will it take for a car with a speed of 50 kilometers per hour to catch up with a car with a speed of 40 kilometers per hour that left two hours ago?
24. Xiaodong went to the fruit shop and bought 3 Jin of apples and 2 Jin of pears * * * paid 15 yuan. How much are apples and pears per kilogram of 3 yuan?
25. Two cars, A and B, leave from A and B at the same time and drive in opposite directions. A travels 50 kilometers per hour, B travels 40 kilometers per hour, A reaches the midpoint earlier than B 1 hour ... How many hours does it take for A to reach the midpoint?
26.a and B are 68 kilometers apart. A and B set out from A and B at the same time, went in opposite directions and met for 2 hours. Given that the speed of A is 15km/, find the speed of B. ..
27. Two ropes with the same length, the first one was cut16m, and the second one was three times as long as the remaining one. How long are these two ropes?
28. A school bought seven basketballs and 10 soccer balls and paid 248 yuan. As we all know, the price of each basketball is equivalent to the price of three footballs. How much is basketball and football each?
29. A number plus 25 equals the difference between 1 10 and 75. What's this number?
The product of 30, 5 and 9 minus three times a number is 2. 1. Find this number.
3 1, 3 times of a number is less than 5 times of it, 1.8, find this number.
The fruit shop sent 30 baskets of apples and 25 baskets of pears. Apple I is 25 kilograms heavier than pear. As we all know, each basket of apples weighs 30 kilograms. How many kilograms does each basket of pears weigh?
33. The children's bookstore brought 15 kinds of story books, each with 30 books. Some were sold, and there were 120 copies left. How many story books have been sold?
34. Team A and Team B process 1680 parts in 6 days, while Team A processes 144 parts every day. How many parts does Team B process every day?
There are 3000 chickens and ducks in the chicken farm, and the number of chickens is three times that of ducks. How many chickens and ducks are there respectively?
36. Seven bags of rice and three bags of flour weigh 425 kilograms, and it is known that each bag of rice weighs 50 kilograms. Find the weight of each bag of flour.
37. There are 72 tons of wheat in warehouse A and 48 tons in warehouse B. How many tons are transported from warehouse A to warehouse B, and the wheat in the two warehouses is the same?
38. A barrel of oil weighs 8 kilograms. After pouring out half, the barrel weighs 4.5 kilograms. How much does a barrel of oil weigh?
39. Divide a big fish weighing 16kg into three parts: head, body and tail. The fish tail weighs 4 kilograms, and the weight of the fish body is equal to twice the weight of the fish head. How much does this big fish weigh?
40. Two cars, A and B, start from east and west at the same time. Car A travels 56 kilometers per hour and car B travels 48 kilometers per hour. The two cars met at a distance of 32 kilometers from the midpoint. What's the distance between east and west?
The answer part:
1, solution: let two cars meet in x hours.
3 1x+44x=300
75x=300
x=4
A: After 4 hours, the distance between the two cars is 300 kilometers.
2. Solution: The tunnel will be dug in X days.
3x+4= 126
7x= 126
x= 18
Answer: 18 days later, the tunnel was dug.
3. solution: there are x people in the art group.
6x+x= 140
7x= 140
x=20
A: There are 20 people in the art group.
4. solution: suppose my brother walked for x minutes.
80x+ 180x= 1300×2
260x=2600
x=2600÷260
x= 10
A: At this time, my brother left 10 minutes.
5. solution: suppose these fruits can be distributed to x children.
3x= 17
x= 1 17÷3
x=29
A: These fruits can be distributed to 29 children.
6. Solution: Suppose X tons of coal are delivered in the afternoon.
1 1.5+x=24.3
x=24.3- 1 1.5
x= 12.8
A: In the afternoon, the coal was transported 12.8 tons.
7. solution: let the middle number be X.
x-2+x+x+2=57
3x=57
x = 57 \3
x= 19
A: The middle number is 19.
8. Solution: There are x white keys.
x-26=48
x=26+48
x=74
A: There are 74 white keys.
9. Solution: Let this car run at the speed of X kilometers per hour.
4x= 128
x= 128÷4
x=32
This car travels 32 kilometers per hour.
10, solution: let the width of this rectangle be x cm.
(x+3)×2=9.8
x+3=9.8÷2
x+3=4.9
x=4.9-3
x= 1.9
The width of this rectangle is 1.9 cm.
1 1, solution: suppose it has to be shipped x times before it can be shipped.
4×3+2.5x=29.5
12+2.5x=29.5
2.5x=29.5- 12
x= 17.5÷2.5
x=7
A: It will take seven more shipments to complete.
12, solution: Let its height be x meters.
(7+ 1 1)×x÷2=90
18x÷2=90
18x=90×2
x= 180÷ 18
x= 10
A: Its height is 10 meter.
13, solution: let each pen be x yuan.
10×0.5+ 15x=50
5+ 15x=50
15x=50-5
x=45÷ 15
x=3
3 yuan money per pen.
14, solution: suppose that x parts are produced every day on average in these 7 days.
7x+240= 1290
7x= 1290-240
x = 1050 \7
x= 150
Answer: During these seven days, the average daily production was 150 parts.
15, solution: let the second train run at x kilometers per hour.
3×45+3x=272- 17
135+3x=255
3x=255- 135
x= 120÷3
x=40
A: Car B is 40 kilometers per hour.
16, solution: suppose the average grade of class 6 (2) is X.
40×87. 1+42x=(40+42)×85
3484+42x=6970
42x=6970-3484
x=3486÷42
x=83
Answer: The average grade of Class 6 (2) is 3 points.
17, solution: let each box have an average of x boxes.
10x=250+550
10x=800
x = 800 \ 10
x=80
A: The average box is 80 boxes.
18, solution: Let each group have an average of X people.
5x=200-80
x= 120÷5
x=24
A: There are 24 people in each group on average.
19, solution: set up a canteen to deliver X kilograms of flour.
3x-30= 150
3x= 150+30
x= 180÷3
x=60
A: 60 kilograms of flour were delivered from the canteen.
20. Solution: Assume that there are X pear trees in each row on average.
6x-20=52
6x=52+20
x=72÷6
x= 12
A: On average, there are 12 pear trees in each row.
2 1, solution: let every child's clothes be x meters.
20×2.4+ 16x=72
48+ 16x=72
16x=72-48
x=24÷ 16
x= 1.5
A: The fabric of each child's clothes is1.5m. ..
22. Solution: Suppose our daughter is X years old this year.
(x-3)×6=33-3
x-3=30÷6
x=5+3
x=8
A: My daughter is 8 years old this year.
23. solution: it takes x hours.
50x=(x+2)×40
50x=40x+80
50x-40x=80
10x=80
x=80÷ 10
x=8
A: It will take eight hours.
24. Solution: Set the pear as X yuan per kilogram.
3×3+2x= 15
9+2x= 15
2x= 15-9
2x=6
x = 6 \2
x=3
Pears are 3 yuan per kilogram.
25. Solution: Let A reach the midpoint in x hours.
50x-40x=40
10 x=40
x = 40 \ 10
x=4
A: A reaches the midpoint within 4 hours.
26. Solution: Let the speed of B be X km/h. ..
2×( 15+x)=68
15+x=68÷2
x=34- 15
x= 19
A: The speed of B is 19 km/h. ..
27. Solution: Let the original two ropes be x meters long.
3(x- 16)=x
3x-3× 16=x
3x-48=x
3x-x=48
2x=48
x=48÷2
x=24
A: It turns out that these two ropes are 24 meters long.
28. Solution: If each football is worth X yuan, then each basketball is worth 3x yuan.
7×3x+ 10x=248
2 1x+ 10x=248
3 1x=248
x=248÷3 1
x=8
3x = 3x8 = 24 (yuan)
Every football 8 yuan, every basketball 24 yuan.
29. solution: let this number be X.
x+25= 1 10-75
x+25=35
x=35-25
x= 10
30. solution: let this number be X.
5×9-3x=2. 1
45-3x=2. 1
3x=45-2. 1
x = 42.9 \3
x= 14.3
3 1, solution: let this number be X.
5x-3x= 1.8
2x= 1.8
x= 1.8÷2
x=0.9
32. Solution: Let each basket of pears weigh X kilograms.
30×30-25x=25
900-25x=25
25x=900-25
x = 875÷ 25
x=35
Each basket of pears weighs 35 kilograms.
33. Solution: Suppose X story books are sold.
120+x=30× 15
120+x=450
x=450- 120
x=330
330 story books were sold.
34. Solution: Team B processes X parts every day.
144+x= 1680÷6
x=280- 144
x= 136
A: Team B processes 136 parts every day.
35. Solution: If you have x ducks, you will have 3x chickens.
x+3x=3000
4 x=3000
x = 3000 \4
x=750
3 x = 3× 750 = 2250 (only)
A: There are 750 ducks and 2250 chickens.
36. Solution: Let each bag of flour weigh X kilograms.
7×50+3x=425
350+x=425
3x=425-350
x=75÷3
x=25
Each bag of flour weighs 25 kilograms.
Solution: Assuming that X tons of wheat are transported from warehouse A to warehouse B, the two warehouses will be the same.
72-x=48+x
x = 72 x-48
x=72-48-x
x=24-x
x+x=24
2 x=24
x = 24 \2
x= 12
A: After 65,438+02 tons of wheat were transported from warehouse A to warehouse B, the two warehouses will be the same.
Solution: make this oil weigh x kilograms.
4.5+0.5x=8
0.5 x=8-4.5
x=3.5÷0.5
x=7
This barrel of oil weighs 7 kilograms.
39. Solution: If the head of this big fish weighs X kilograms, the body of the fish weighs 2 kilograms.
x+2x+4= 16
3 x= 16-4
x= 12÷3
x=4
2 x = 2× 4 = 8 kg
This big fish weighs 8 kilograms.
40. solution: let car a and car b meet for x hours.
(56-48)x=32×2
8x=64
x = 64 \8
x=8
(56+48) × 8 = 832km
A: The distance between east and west is 832 kilometers.
Math 120: I wish you progress in your study!