![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
How many tons of cement do you need to tow a pile of cement to B pile every time
Since the total amount is 120 tons, if pile B is twice as much as pile a, pile B is 80 tons, and pile a is 40 tons, then pile a needs to transport 60 tons. If it comes out five tons at a time, it will be 12 times
A batch of goods was transported 35% in the first time and 78 tons in the second time, which accounted for 65% of the total amount?
The total quantity of the goods is x tons
35%x+78=65%x
30%x=78
x=260
260 tons
78/（65%-35%）
Three cars of a, B and C carry a pile of coal. Car a carries 40% of the total, while car B carries 60% of car C,
It is known that car a carries 28 tons more than car B. how many tons of coal is this pile?
To detailed steps Oh, online and so on
thank you!
0.4x-28=0.6x*（60/160）
How did this 60 / 160 come about? What do you mean?
thank you!!!!
The total quantity of coal is x tons
0.4x-28=0.6x*（60/160）
By solving the equation, we can get x = 160
Because the ratio of B to C is 60%: 1 = 6:10, B accounts for 6 / 16 of the total number of B and C
Let the total coal be a
40% by car a, 40% by car B, 40% by car A-28, 40% by car C (40% by car A-28) / 60%
The sum of three trucks is a pile of coal a
40%a+（40%a-28）+（40%a-28）/60%=a
(2+5/3)40%a-28(1+5/3)=a
[(2+5/3)40%-1]a=28(1+5/3)
a=160
This pile of coal amounts to 160 tons
Two cars are driving from a to B at the same time. The speed of a is 80 km / h, and that of B is 120 km / h. how many hours later are the two cars 100 km apart? At this time, car B is just half of the whole journey. What is the distance between a and B?
100÷（120-80）
=100÷40
=2.5 hours
120 × 2.5 × 2 = 600 km
One
100 ÷ (120-80) = 2.5 hours
Two
120 × 2.5 × 2 = 600 km
For a batch of goods, 143 tons were transported in the first time, 5 / 12 of the total in the second time, and 7 / 8 of the total in the two times. How many tons are there?
This batch of goods: 143 (7 / 8-5 / 12) = 312 tons
Car a, car B and car C transport a pile of coal. Car a transports 2 / 5 of the total tons, and car B transports 3 / 5 of car C. It is known that car a transports 28 tons more than car B,
How many tons of coal is this pile
Car C = (1-2 / 5) / (1 + 3 / 5) = 3 / 8
Car B = 1-2 / 5-3 / 8 = 9 / 40
Total = 28 (2 / 5-9 / 40) = 160 tons
(1-2 / 5) / (3 / 5 + 1) × 3 / 5 = 9 / 40
Total: 28 (2 / 5-9 / 40) = 160 tons
Total x tons
A: (2 / 5) * x
Car B: (2 / 5) * x-28
Car C: [(2 / 5) * x-28] / (3 / 5)
A + B + C = x
x=160
From city a to city B, a car can arrive at the speed of 120 km / h for 2 hours. After the whole race, the time ratio of a bus to a car is 5:4,
What's the speed of the car
It takes 35 minutes to saw a 4-meter-long piece of wood into 0.5-meter-long sections. According to this calculation, how many minutes does it take to saw it into 0.4-meter-long sections?
First: the distance from city a to city B: 120kmx2h = 240km
Bus time: 2x5 / 4 = 2.5h
The speed of the bus is 240km except 2.5h = 96km / h
The second method is that if the speed of the bus is x, the following results can be obtained
120×2=5/4×2X
The solution is: x = 96 km / h
The second question: each segment is 0.5m long, there are 8 segments need to be sawed 7 times. The time of each sawing is 5 minutes
Each segment is 0.4 m long, 10 segments need to be sawed 9 times, 5 minutes each time, 45 minutes
The rest of the goods will be transported in the second day. The first batch will be transported in the second day___ .
(1-37) × 58 + 37 = 47 × 58 + 37 = 514 + 37 = 1114 answer: 1114 of this batch of goods were transported twice
A, B, C two cars transported a batch of coal, a transported 40% of the total, B car transported 60% of C car, known as a
Car a, car B and car C carry a batch of coal. Car a carries 40% of the total amount, while car B carries 60% of car C. It is known that car a carries 28 tons more than car B. how many tons of coal are there in total?
160 tons
Let the total yield be x tons
A: 40% X
B: 40% x-28
C: x-40x - (40% x-28)
The equation is: 40% x-28 = (x-40% X - (40% x-28)) X60%
The distance between city a and city B is 120 km. If the speed of a car from city a to city B is increased to 1.2 times of the original speed, it will arrive 20 minutes ahead of time: how many kilometers per hour is the original speed of the car?
Suppose the original speed of the car is x kilometers per hour
120/X-120/1.2X=20/60
144-120 =1/3*1.2X
0.4X =24
X =60
The test shows that x = 60 is the solution of the original equation
A: the original speed of the car is 60 kilometers per hour
The following is the standard answer format.
20 minutes is a third of an hour.
Let the speed of the original car be x (km / h)
120÷x=120÷1.2x+1/3
120/x=100/x+1/3
120=100+x/3
x/3=20
x=60
It is proved that x = 60 is the solution of the original equation.
A: the original speed of the car was 60km / h.
1/1.2=5/6
5/6-1=1/6
20/1/6=120
120/120=1m
1*60=60m
RELATED INFORMATIONS
- 1. A batch of goods were transported away for the first time and 78 tons for the second time, accounting for 65% of the total amount. How many tons of this batch of goods?
- 2. The mass ratio of coal in pile a, pile B and pile C is 2:3:5. The average weight of these three piles of coal is 15 tons. How many tons is pile a less than pile B?
- 3. A and B start from a to B at the same time. It is known that the speeds of a and B are 80 km / h and 60 km / h respectively. If a and B are x km apart, then
- 4. A, B and C transported 40% of the total amount of wheat, 150 kg more than B. the weight ratio of B to C was 3:2 How many kilos?
- 5. Party A and Party B transport a batch of cement together. At the end of the transport, party a transport more than two fifths of the total amount of 14 tons, Party B transport more than one fourth, how many tons did party a transport
- 6. There are 72 tons of coal in pile a and pile B. four fifths of the coal in pile a is transported and 75% of the coal in pile B is transported. The remaining coal is exactly the same. How many tons of coal are there in the two piles?
- 7. A batch of cement has to be transported by car. In the first time, one-third less than 5 tons of the total cement has been transported. In the second time, one-quarter more than 3 tons of the total cement has been transported. There are 27 tons left. How many tons of this batch of cement?
- 8. A and B piles of coal are the same weight. A pile of coal carries a quarter of its weight, B pile of coal carries a quarter of its weight. What is the weight of the remaining two piles of coal? A: Coal in pile a is heavier than that in pile B. coal in pile B is heavier than that in pile A. coal in pile B is heavier than that in pile A. coal in pile a is heavier than that in pile B. coal in pile B is heavier than that in pile A. coal in pile B is heavier than that in pile A. coal in pile C is
- 9. In order to transport 450 tons of yellow sand to the construction site, one third of the total amount will be transported in the first time, and two fifths of the total amount will be transported in the second time. How many tons will be transported
- 10. The quality ratio of rice in warehouse A and warehouse B is 5:2. If 20% of the rice is taken from warehouse A and put into warehouse B, then the rice in warehouse A is 12 tons more than that in warehouse B. how many tons of rice are there in warehouse A and warehouse B?
- 11. If the weight of coal in pile a is 16 less than that in pile B, the following statements are correct: (1) the weight of pile B is 20% more than that in pile a; (2) the weight ratio of pile a and pile B is 6:7; (3) if 112 is taken from pile B to pile a, the weight of two piles of coal will be the same. (4) pile a accounts for 511% of the total weight of two piles of coal A. ①②③B. ①②④C. ①③④D. ②③④
- 12. The transport team went to the warehouse to transport cement. On the first day, 15% of the total cement was transported out, and on the second day, 36 tons of cement was transported in. At this time, the cement in the warehouse was 87.5% of the original. How many tons of the original cement in the warehouse?
- 13. On a map with a scale of 1:2000000, the distance between a and B is 6cm. How many hours does it take for a car to go from place a to place B at the speed of 80km per hour?
- 14. There are 540 tons of coal in Party A and Party B. when Party A uses three-quarters of the coal and Party B uses four fifths of the coal, the two piles have the same amount of coal left. How many tons of coal are there in Party A and Party B
- 15. For a pile of coal, one eighth of the total amount is used for the first time, and 20 tons are used for the second time. This is 75% of the total amount left. How many tons of coal was there originally?
- 16. Two cars a and B leave in the opposite direction at the same time. After two minutes and three hours, the distance between the two cars is 204 kilometers. The speed ratio of the two cars a and B is 8:9
- 17. For two piles of coal, a quarter of them are transported from pile a, and the remaining three fifths are transported from pile B. This is three fifths of the weight of pile a and pile B. the original weight of pile a is 120 tons. How many tons are there in pile B?
- 18. After two fifths of a pile of coal was used, 56 tons of coal was transported in. Now it's 30% more than before. How many tons of coal do you want?
- 19. To build a highway, team a has 120 people, and one fifth of the number of team a is transferred to team B. at this time, the number of team a and team B is equal. How many people are there in team B
- 20. A heap of coal weighs five sixths of a ton. If a transports one sixth to B, B will be one sixth lighter than A. how many tons is a heavier than B?