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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?
The distance between a and B: 6 △ 12000000 = 12000000 (CM) = 120 (km); from a to B, it takes 120 △ 80 = 1.5 (H); a: from a to B, it takes 1.5 hours
Party A and Party B transport a batch of cement together. At the end of the transport, Party A transports more than two fifths of the total amount of 14 tons, and Party B transports more than one fourth. How many tons did party a transport?
Total: 14 ÷ (1-2 / 5-1 / 4) = 40 tons
A: 40 × 2 / 5 + 14 = 30 tons
There are two piles of coal. The weight of pile a is five sixths of that of pile B. after pile a transports five sixths of it, pile B is 62 tons more than pile A. how many tons is the original weight of pile a?
According to the meaning of the title:
Design a original M1 tons of coal
B: tons of coal
∴5/6M2=M1
（1-5/6）M1+62=M2
Simultaneous solution
M1 = 60 tons
M2 = 72 tons
A and B leave city a and city B at the same time. At 59 o'clock, car a meets car B. after meeting, car B continues to advance at the speed of 60 kilometers per hour and takes 1.5 hours to complete the rest of the journey. How many kilometers are there between city a and city B?
(60 × 1.5) △ 59, = 90 △ 59, = 162 (km). A: the distance between a and B is 162 km
Party A and Party B transport a batch of cement together. At the end of the transport, party a transport more than 2 / 5 of the total 14 tons, Party B transport more than 1 / 4 of Party A, and how many tons does party a transport
The best formula
B shipped all: 3 / 5 less 14 tons
All are:
[14x(1+1/4)+14]÷(3/5-1/2)
=63/2÷1/10
=315 tons
It's the first time
315x2/5+14
=126+14
=140 tons
If there are x tons of cement in this batch, car a will transport [(2 / 5) x + 14] tons, and car B will transport [(3 / 5) x-14] tons,
[（3/5)x-14]=（1+1/4)[(2/5)x+14]
x=315
[(2/5)x+14]=140
A car transported 140 tons
A and B two piles of coal, a to B one seventh, B to a quarter, after each 180 tons. Ask B how many tons?
Before ten!
(6/7)x+(1/4)y=180
(3/4)y+(1/7)x=180
y=3600/17
A: 180 / (1-1 / 7) = 210
B: 180 / (1-1 / 4) = 240
There are two cars in the same direction on the same road. At the beginning, car a is 3 kilometers away from car B, and car a is going at a speed of 60 kilometers per hour,
Car B is going at a speed of 72 kilometers per hour. How far is the distance between the two cars one minute before car B overtakes car a?
We need to be formulaic, not equations
Catch up per minute (72-60) * 1 / 60 = 0.2km
If "the first minute" means that you can catch up in one minute, then the initial distance is more than 3km, and the answer is 0.2km
If "the first minute" refers to the first minute of catching up, then the demand is 3-0.2 = 2.8km - the answer is 2.8km
There are 250 bags of cement in the warehouse. One fifth of the total will be used in the first time, and the remaining two thirds will be used in the second time. How many bags will be used in the two times?
Process, not equation
Use all of them the second time:
(1-1/5)x1/2=2/5
Two times in total:
250x(1/5+2/5)
=250x3/5
=150 (bag)
One fifth of the total amount is used for the first time, that is, 50 bags are used, and 200 bags are left at this time
For the second time, use the remaining 1 / 2, that is 200 / 2 = 100 bags
So 50 + 100 = 150 bags
150 bags, the first 20% is 50 bags, the second 50% is 100 bags, a total of 150 bags.
There are two barrels of oil a and B. If one seventh of the oil in barrel a is poured into barrel B, then the quality of the two barrels of oil is equal to that of barrel B
There are two barrels of oil a and B. If one seventh of the oil in barrel a is poured into barrel B, the quality of the two barrels of oil is equal. How much of the oil in barrel B is equivalent to that in barrel a?
Let a be x and B be y,
When one seventh of the oil in a barrel is poured into B barrel, a becomes 6x / 7, B is y + X / 7,
From the equal mass of two barrels of oil, 6x / 7 = y + X / 7,
Then y = 5x / 7,
So the quality of B barrel is equal to 5 / 7 of that of a barrel,
There are two barrels of oil a and B. If one seventh of the oil in barrel a is poured into barrel B, then the quality of the two barrels of oil is equal. How much of the oil in barrel B is equal to that in barrel a???
Car a is going at a speed of 60 kilometers per hour, and car B is catching up at a speed of 100 kilometers per hour. The distance between the two cars is 9 seconds before car B overtakes car a______ Rice
60 kilometers = 503 meters per second, 100 kilometers per hour = 2509 meters per second, (2509-503) × 9 = 1009 × 9, = 100 meters. A: nine seconds before car B overtakes car a, the distance between the two cars is 100 meters
RELATED INFORMATIONS
- 1. 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?
- 2. 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
- 3. How many tons of cement do you need to tow a pile of cement to B pile every time
- 4. 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?
- 5. 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?
- 6. 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
- 7. 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?
- 8. 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
- 9. 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?
- 10. 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?
- 11. 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
- 12. 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?
- 13. 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
- 14. 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?
- 15. 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?
- 16. 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
- 17. 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?
- 18. 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
- 19. 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?
- 20. 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?