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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
A + B = total
A = 2 / 5 total + 14T -- ②
B = (1 + 1 / 4) a -- ③
Take 3 into (1) and get: a + (1 + 1 / 4) a = total
A = 4 / 9 Total
If you take formula 4 into formula 2, you will get
4 / 9 total = 2 / 5 total + 14T, total = 315T,
Then a = 2 / 5 × 315 + 14 = 140t
The distance between a and B is 385km. A bus and a truck leave from the two places respectively. After 5 hours, the two cars meet, and the bus travels 65km per hour
How many kilometers does the truck travel per hour? Let the truck travel x kilometers per hour!
Set up freight cars to travel x kilometers per hour
5(65+x)=385
x+65=385÷5
x=77-65
x=12
If you don't understand this question, you can ask,
5（x+65）＝385
Divide both sides of the equal sign by 5
x+65＝77
x＝77－65
X = 12 (km)
The truck is too slow to drive as fast as the bicycle
A, B two piles of coal a total of 72 stew, a pile of coal transport 4 / 5, B pile of coal transport 75%, the remaining coal is exactly the same, ask the original two piles of coal how many tons?
Set a x tons of coal, b y tons of coal
X+Y=72
（1-4/5）X=（100%-75%）Y
0.2X=0.25 Y
Y=0.2/0.25 X=0.8 X
0.8 X+ X=72
1.8X=72
Calculate x = 40, y = 32
It's not easy to calculate. I hope it can help the landlord, and I hope it can be adopted
A and B start from a and B at the same time. When they start, their speed ratio is 4:3. After meeting, B travels 35 kilometers more per hour than before
A and B start from a and B at the same time, and they travel in opposite directions. When they start, their speed ratio is 4:3. After meeting, B travels 35 kilometers more per hour than before. How many kilometers does a travel per hour when they arrive at the destination at the same time
Let car a be 4x, then car B be 3x
When we met, car B took 3 / 7 of the whole journey, and then took 4 / 7 of the whole journey
1/4x＝（3/7）/3x +（4/7）/（3x+35）
1 / 4x = 1 / 7X + 4 / 7 (3x + 35) multiply by 28
7/x=4/x+16/(3x+35)
3/x=16/(3x+35)
9x+105=16x
7x=105
x=15
A: the original speed of a is 60 km / h
140 H / km, let a speed be 4a, B speed be 3a, total distance be s, time before meeting is T1, time after meeting is T2
4at1 = (3a + 35) T2; 3at1 = 4at2, we can get a = 35, 4A = 140
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, how many tons does party a transport
We need to find the corresponding percentage of 14 tons
1 / 4 + 1 = 5 / 4 (5 / 4 + 1) (2 / 5x + 14) = 1 x = 315, 315x2 / 5 + 14 = 140
2. The distance between Party A and Party B is 270km. A car drives from Party A to Party B and returns to Party A from Party B. it travels 45 km per hour when going there and 54 km per hour when returning
How many kilometers per hour is the average speed of this car?
270/45=6
280/54=5
5 + 6 = 11 (hours)
A: it takes 11 hours to get back and forth by car
I haven't finished the questions yet
270x2 60
Vplane = ----- (km / h)
54+45 11
S total = 270x2 = 540 (km)
270 270
Ttotal = ---- + ---- = 9 (H)
45 54
See what you want
The total weight of coal in pile a and pile B is 72 tons. After 80% of coal in pile a is transported and 75% of coal in pile B is transported, the remaining coal is exactly the same. How many tons of coal are there in each pile?
1-80% = 20%; 1-75% = 25%; the original weight ratio of pile a and pile B is: 25%: 20% = 5:4; 72 × 54 + 5, = 72 × 59, = 40 (tons); 72-40 = 32 (tons); a: pile a used to be 40 tons; pile B used to be 32 tons
A. B & nbsp; the two vehicles leave from the East and West stations at the same time, and the speed ratio of a and B is 4:3. After the two vehicles meet, B increases by 35 kilometers per hour. As a result, the two vehicles arrive at the destination at the same time. Q: how many kilometers per hour does a travel?
35 △ 43 + 4 △ 33 + 4-34, = 35 △ 43-34, = 35 △ 712, = 35 × 127, = 60 km. A: car a travels 60 km per hour
A and B transport a batch of cement together. A and B transport a batch of cement together. At the end of the transport, a transport more than 7 / 15 of the total amount of 18 tons, and B transport it by a vehicle
The tonnage is 50%. How many tons are there in this batch of cement?
Suppose there are x tons of this batch of cement
7x / 15 + 18 + 7x / 30 = x → x = 60 tons
A car travels 54 kilometers per hour from a to B, 45 kilometers per hour from a to B, and it takes 11 hours to go back and forth. How many kilometers is the total length from a to B?
Suppose that it takes x hours to get there by car, 54x = 45 × (11-x) & nbsp; & nbsp; & nbsp; & nbsp; 54x = 495-45x, 54x + 45x = 495-45x + 45x, 99x △ 99 = 495 △ 99, x = 5, 54 × 5 = 270 (km); a: the total length from ground a to ground B is 270 km
RELATED INFORMATIONS
- 1. 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?
- 2. 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?
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- 5. 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?
- 6. One third of the yellow sand is used for the first time, and the remaining one fourth is used for the second time. (1) if it is still 18 tons, how many tons are there in this pile? (2) One third of the yellow sand will be used in the first time, and the remaining one fourth will be used in the second time. (1) if it is still 18 tons, how many tons of yellow sand will there be? (2) if it is 22 tons in two times, how many tons of yellow sand will there be? (3) if it is more than 2 tons in the first time, how many tons of yellow sand will there be?
- 7. There are two cups of water of the same quality. For the first time, pour one-half of a into cup B; for the second time, pour one-third of a into cup a; for the third time, pour one-quarter of a into cup B; for the ninth time, pour one tenth of a into cup B. at this time, how much is the water in cup B?
- 8. There are 6 tons of cement, 6 tons of yellow sand and 6 tons of stone on the construction site. Now a kind of concrete is prepared according to the weight ratio of cement, yellow sand and stone 2:3:4,
- 9. A total of 320 tons of coal are planted in the two piles. The weight of pile a is 60% of that of pile B. how many tons of coal are the two piles?
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- 12. 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
- 13. 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?
- 14. 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?
- 15. How many tons of cement do you need to tow a pile of cement to B pile every time
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- 17. 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?
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- 19. 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
- 20. 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?