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Take 1 / 10 of the apples from box a and put them into box B. at this time, the kilogram of the apples in the two boxes is equal. The kilogram of the apples in Box B is () of the apples in box a Choose. A, 9 / 10 b, 4 / 5 C, 19 / 20. Now
Take 1 / 10 of the apples from box a and put them into box B. at this time, the kilogram of the apples in the two boxes is equal. The kilogram of the apples in Box B originally accounts for 30% of box a
( B、4/5).
A、9/10 B、4/5 C、19/20
Let a and B have X and Y respectively. From the meaning of the title, X-1 / 10 * x = 1 / 10 * x + y, we can get y / x = 4 / 5
Suppose that the kilogram of apple in Box B is X
If the number of apple trees in box a is 1, then Box B is X
Take out 1 / 10 apples from box a and put them into Box B, that is, take out 1 / 10 apples from box a and put them into box a
A left 1-1 / 10 = 9 / 10, B has x + 1 / 10
At this time, the kilogram of two boxes of apples is equal, 9 / 10 = x + 1 / 10 x = 8 / 10 = 4 / 5, so choose B
There is a batch of cement on the construction site. The first time 7.8 tons are used, the second time 7 / 20 are used, and there are still 1.5 tons left. How many tons of this batch of cement?
Solve by equation
Suppose that this batch of cement has x tons, the equation is: x-7.8-7/20 x = 1.5 13 / 20x = 9.3 x = 186 / 13, which is about 14.3 tons
The total weight of pile a and pile B is 78 tons. If 25% of the coal is transported from pile a to pile B, the weight ratio of pile B to pile a is 8:5?
Later, pile a had 78 △ (8 + 5) × 5 = 30 tons. Originally, pile a had 30 △ (1-25%) = 40 tons. Originally, pile B had 78-40 = 38 tons. A: originally, pile a had 40 tons of coal. Pile B had 38 tons of coal
There are 280 apples in box a and 40 apples in box B. take 8 apples out of box a and put them into Box B each time. How many times will the number of apples in the two boxes be equal?
(280 + 40) △ 2 = 160 (pieces); 160-40 = 120 (pieces); 120 △ 8 = 15 (Times)
There is a batch of cement on the construction site. It takes 7.6 tons for the first time, seven tenths for the second time, and the remaining 1.5 tons. How many tons of this batch of cement are there
Set cement x tons
(x-1.5)-7.6=x×7/10
x-9.1=x×7/10
10x-91=7x
10x-7x=91
3x=91
x=91/3
That is: 91 / 3 tons of cement
There are two piles of coal (A and b) with a weight ratio of 5:3. If 25 tons are transported from pile B to pile a, how many tons are there in total?
The current price of a is more than that of B: 25 + 25 = 50 tons
Now a is more than B: (5-3) △ 3 = 2 / 3
Now B has: 50 / 2 / 3 = 75 tons
The original A and B have: 75 + 25 = 100 tons
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If 1 / 6 of the two boxes of apples are taken out of box a and put into Box B, the quality of the two boxes of fruits is exactly the same, then the apples in box a are several times more than those in box B
5/6x=1/6x+y
We get X / y = 3 / 2, that is, more than 1 / 2
Multiple: 1 / 6 + 1 / 6 = 2 / 6 = 1 / 3
Let a be x, B be y
5x/6=x/6 + y
4x/6=y x=3y/2
There are 1 / 2 more apples in box a than in box B
It must be half. I'll make a drop
A pile of cement was transported to a construction site. It took 15% of the total on the first day, 25% on the second day, 15 tons on the third day, and 7 tons left. How many tons of this batch of cement were used?
(15 + 7) △ 1-15-25%) = 22 △ 1120 = 40 tons a: this pile of cement is 40 tons
The weight of the two piles of coal is equal. Now 24 tons of coal are transported from pile a, and 8 tons are transported from pile B. at this time, the weight of pile B is three times that of pile A. how many tons of coal were there in each pile?
A pile of coal: (24 + 8) △ 3-1, = 32 △ 2, = 16 (tons), a original: 16 + 24 = 40 (tons); a: two piles of coal each had 40 tons
There are two boxes of apples, box a and Box B, of which the number of Box B is 3 / 4 of that of box a, and two are less. If 3 / 20 is taken out of box a and put into Box B, then there are two boxes of apples
How many boxes are there
The process of solution
x-3/20x=3/4x-2+3/20x
x=3/4x-2+3/10x
2=1/20x
x=40
It seems that there are no conditions. Many questions
RELATED INFORMATIONS
- 1. A pile of cement was transported to a construction site. It took 15% of the total on the first day, 25% on the second day, 15 tons on the third day, and 7 tons left. How many tons of this batch of cement were used?
- 2. The tonnage ratio of a and B is 3:2. A accounts for half of the total amount of coal transported from a to B. how many tons of coal are there in the original B?
- 3. 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
- 4. 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?
- 5. 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?
- 6. 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?
- 7. 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
- 8. 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?
- 9. 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
- 10. 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?
- 11. A pile of 15 tons of coal is transported in six times, with an average of () / () [fraction] of the pile of Coal Transported each time
- 12. There are 640 tons of cement in a construction site. 8 / 3 of the total amount is used in the first time, and the remaining 8 / 3 is used in the second time. How much cement is used in the two times
- 13. The ratio of people in workshop a and workshop B is 5:4. If 21 people are transferred from workshop a to workshop B, their ratio is 2:3. How many people are there in workshop a and workshop B
- 14. There are two tons of coal in pile a and pile B, 24 tons in pile A. if one eighth of the coal in pile a is put into pile B, then the weight of two tons of coal is equal. How many tons of coal in pile B? The total weight of two barrels of oil is 10.8 kg. Pour a quarter of the oil out of the first barrel and put it into the second barrel for 3.2 kg. At this time, the two barrels of oil are equal in weight. How many kg are the first and second barrels? The weight of the remaining boxes is exactly 3 kg. How much is the weight of each box? It costs 300 yuan to buy 8 big blackboards and 12 small blackboards. One big blackboard costs 2.5 yuan more than two small blackboards. How much does each big blackboard cost?
- 15. When a batch of goods is to be transported to a certain place, the owner of the goods is going to rent two kinds of trucks from the motor transport company. The situation of renting these two kinds of trucks in the past is shown in the table below Now we rent 5 A-type trucks and 6 B-type trucks from the company. We have just finished the goods at one time. How many tons of the goods are there? The first time and the second time Number of goods vehicles of Party A 3 2 Number of vehicles of goods B 4 3 Cumulative tonnage 36 26
- 16. A passenger car and a freight car leave from the two places at the same time. The distance between the two cars is 20 kilometers in 4.5 hours. The known speed of the passenger car is 60 kilometers per hour, and the speed of the freight car is 70% of that of the passenger car. How many kilometers is the distance between the two cities?
- 17. There are two kinds of trucks. Car a can load 6 tons of coal each time, and car B can load 8 tons of coal each time. There are 400 tons of coal at present, which are required to be transported at one time, and each truck can be transported at the same time It's just full. How many trucks do you need? Requirements: column equation, column formula are OK, as long as the reason, the process to be listed
- 18. The transport team transported a batch of rice to the disaster area. In the morning, it took 4 trucks to transport 25, with an average of 20% per truck______ What about the rest of the rice______ The car can't be finished
- 19. When the two vehicles meet, the distance ratio of the two vehicles is 5:4; after the meeting, the truck is 27 kilometers faster than the bus per hour As a result, the two cars arrived at the other side's departure station at the same time. It is known that the freight car has been running for 10 hours. How many kilometers is the distance between a and B?
- 20. A and B have 300 tons of coal in total. A transports two fifths of the coal and B transports back two fifths of the coal. Now B has 20 tons more than A. how many tons each of a and B?