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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?
Original = 20 (1-75% - 1 / 8) = 160 tons
There are 44 tons of coal in pile a and pile B. one fifth of the coal in pile a is transported and 10 tons in pile B. the two piles are the same weight. How many tons in pile B?
If there are x tons of coal in pile a, then there are (44-x) tons of coal in pile B
X－1/5X＝44－X+10
4/5X＋X＝54
9/5X＝54
X＝30
A has 30, B has 14
The speed ratio of car a and car B is 6:5. They leave from a and B at the same time. When they meet, car a travels 240 kilometers, and how many kilometers does car B travel
Answer whatever you like. No bivariate linear equation
B = 240 × 5 km
B
240 △ 6X5 = 200 km
240/6*5=200
There is a pile of coal, 20 tons are used, and 75% of the total amount is left. How many tons of coal is there in this pile? (explain the process and why do you want to do this
75% left - 25% spent
That is: 20 tons, accounting for 25% of the total
So, total = 20 △ 25% = 80 (tons)
A: there used to be 80 tons of coal in this pile
Total number of media removed: 1-75% = 25%
So the total amount of coal is: 20 △ 25% = 80 tons
100/[100-75]=4
20 * 4 = 80 tons
Suppose that the pile of coal is x tons
（x-20）=x×75%
x-20=0.75x
0.25x=20
x=80
That is: this pile of coal was originally 80 tons
There is a pile of coal, 20 tons are used, and 75% of the total amount is left, so 1-75% = 25% is used
So 20 (1-75%) = 80
Two piles of coal a and B are 180t in total. Two fifths of the coal is transported from pile a and one tenth of the coal is transported from pile B. at this time, the remaining coal in the two piles is equal. How many tons of coal are left in pile a and pile B
A and B start from a and B at the same time, and run in opposite directions. After 5 hours of meeting, B runs 180 kilometers. If the speed ratio of a and B is 5:6, how many kilometers is the distance between a and B?
A: the distance between a and B is 330 km
There is a pile of coal, 20 tons are used, and 75% of the total amount is left. How many tons of coal is this pile?
The formula is important
20 / (1-0.75) = 80 (tons)
Set: a pile of coal x tons
X-20 = x times 75 percent
=80 tons
The total weight of pile a and pile B is 540 tons. The weight of pile a is four fifths of that of pile B. how many tons less is pile a than pile B?
To calculate the formula, steps, results
B: 540 (1 + 4 / 5) = 300 tons
A: 540-300 = 240 tons
Pile a is less than pile B: 300-240 = 60 tons
B = 540 (1 + 4 / 5) = 300 tons
Less = 300 - (540-300) = 60 tons
On the highway, cars a, B and C drive at a constant speed of 80, 70 and 50 kilometers per hour respectively. A drives from station a to station B, while B and C drive from station B to station a. a meets C two hours after meeting B, then the distance between station a and station B is shorter______ Km
Suppose the distance between station a and station B is x km. According to the meaning of the question, we get: X80 + 50-x80 + 70 = 2, the solution is x = 1950, so the answer is 1950
For a batch of cement, 30% of the total amount was transported in the first time, 8 tons more in the second time than in the first time, and 65% of the total amount was transported in the two times. How many tons of this batch of cement?
A: this batch of cement is 160 tons in total
RELATED INFORMATIONS
- 1. 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
- 2. 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?
- 3. 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?
- 4. 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
- 5. How many tons of cement do you need to tow a pile of cement to B pile every time
- 6. 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?
- 7. 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?
- 8. 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
- 9. 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?
- 10. 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
- 11. 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
- 12. 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?
- 13. 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?
- 14. 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
- 15. 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?
- 16. If another 15 tons of cement are transported away, the ratio between the transportation and the rest is 1:1. How many tons of cement are there
- 17. There are 338 people in fire brigade a and B, 17 of whom are transferred to fire brigade a and 13 of whom are transferred to fire brigade B. a total of 78 people are transferred. How many people are there in fire brigade a and B?
- 18. Party A and Party B transport a pile of coal together. Party A transports more than 25% of the total amount of coal, and Party B transports 50% of the total amount of coal. How many tons of coal are there?
- 19. There are 45 tons of cement in the construction site, 15 tons of which are used in the first time and 13 tons of which are used in the second time?
- 20. There are 100kg apples in the two boxes. If 12kg apples are taken out of box a and put into Box B, then box a is 4kg more than box B How many kilos each of the two boxes of original fruit