1. For a pile of coal, one fourth of it is transported away for the first time, and 140 tons are transported away for the second time. At this time, the ratio of the remaining tons of coal to the tons transported away is 2:3. How many tons of coal is the original pile of coal? 2. Two identical containers are filled with brine. The ratio of salt to water in the first container is 2:3, and the ratio of salt to water in the second container is 3:4?

1. For a pile of coal, one fourth of it is transported away for the first time, and 140 tons are transported away for the second time. At this time, the ratio of the remaining tons of coal to the tons transported away is 2:3. How many tons of coal is the original pile of coal? 2. Two identical containers are filled with brine. The ratio of salt to water in the first container is 2:3, and the ratio of salt to water in the second container is 3:4?

1. A pile of coal, the first time to transport a quarter of it, the second time to transport 140 tons, then the remaining tons of coal and the ratio of transported tons is 2:3. How many tons of coal? 140 △ 1-1 / 4-2 / (2 + 3)] = 140 △ 1-1 / 4-2 / 5] = 140 △ 0.35 = 400 tons. 2

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1. The ratio of the number of people in workshop a and workshop B is 5 / 7. Now we are adjusting the number of people from workshop B to workshop A. now the ratio of the number of people in workshop a and workshop B is 4:5. How many people were there in workshop a,
A glass of milk, half full of water after drinking, half full of water after drinking, half full of water after drinking, and half full of water after drinking, and then drink all of them. How much is the ratio of milk to water?
(formula calculation,

5 + 7 = 12 there are 12 employees in the two workshops. 4 + 5 = 9 after adjustment, the number of employees can be regarded as 9 employees. 5 (7 / 12-5 / 9) = 180 employees. The number of employees in workshop B originally accounts for 7 / 12 of the total employees, but now it is 5 / 9. Because five employees are transferred, they correspond to the difference between the two scores. 180 × 5 / 12 = 75 employees

Seek a few sixth grade volume of the application of the application of the problem than
It's a little more difficult. It's better to have solutions to equations. (also need answers) as many as there are

1. A and B start from a and B at the same time, and go to B and a respectively. The speed ratio of the two is 7 ∶ 6. When they meet, they continue to move forward. At this time, B's speed is faster than the original speed per hour
2. On the map with the scale of 1:5000000, the distance between the two places is 6cm. Two cars a and B drive from the two places at the same time and meet two hours later. It is known that the speed ratio of car a and B is 2:3. Q: how many kilometers does car B travel per hour
3. The ratio of the degrees of the three internal angles of a triangle is 1:2:3. What is the largest angle?
4. Use a 48dm long iron wire to make a cuboid frame, so that its length, width and height ratio is 5:4:3. Paste a layer of paper on the outside of the cuboid frame, at least how many square decimeters of paper? How many cubic decimeters of its volume?
5. The number of students in class A and class B is equal, and some of them participate in the math group. The number of students in class a participating in the math group is just one third of that in class B not participating in the math group; the number of students in class B participating in the math group is just one fourth of that in class a not participating in the math group?