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For a pile of coal, more than 30 tons of 40% of the total coal was transported in the first time, 10 tons more than 2 / 3 in the second time, and 120 tons in the third time. How many tons of this pile of coal? The two trains leave from a and B at the same time and meet at 48km from the midpoint after 4 hours. It is known that the local train is 5 / 7 of the speed of the express train. What are the speeds of the express train and the local train? What is the distance between a and B?
48 * 2 / 4 / 2 * 5 = slow / hour
48 * 2 / 4 / 2 * 7 = fast / hour
48 * 2 / 4 / 2 * (5 + 7) = distance
（X40%+30）+（X40%+30）*2/3+10+120=Y
one hundred and twenty
The school sent a batch of coal. In January, it burned all 23 tons less than 1 ton. In February, it burned the remaining 25 tons more than 1 ton. At this time, there are still 4 tons left. How many tons of this batch of coal are there?
[(4 + 1) / (1 − 25) - 1] / (1 − 23) = [5 − 35-1] / - 13, = [5 × 53 − 1] / - 13, = [253 − 1] / - 13, = 223 − 13, = 223 × 3, = 22 (T); a: this batch of coal is 22 t
RELATED INFORMATIONS
- 1. A batch of coal for heating in winter was transported from schools in the urban area. In December, 2 / 3 of the total coal was used, less than 2 tons. In January, the remaining 40% of the total coal was used, more than 3 tons. At this time, there were 6 tons left, How many tons of this coal?
- 2. For a pile of chemical fertilizer, 25% of the total weight is transported in the first time, the remaining 59 tons are less than 10 tons in the second time, and the remaining 74 tons are transported in the third time. How many tons are there in total?
- 3. A pile of coal weighs 9 / 7 tons. After 1 / 7 is used up, there are still 8 / 7 tons left After cutting the cube wood block with the edge length of a meter into two small cuboids, the sum of the surface areas of the two cuboids is equal to the surface area of the original cube. () if a commodity is sold at a 20% discount, it is 15% cheaper than the original price. () a is more than 1, The reciprocal of a must be less than 1. (3 / 5 of 4 meters is as long as 4 / 5 of 3 meters.)
- 4. One ton of coal weighs 8.4 tons. One third of the coal is transported away for the first time, and the remaining half is transported away for the second time. How many tons are left
- 5. A pile of coal, the first day to use one fifth, the second day to use two fifths of tons, just used up, this pile of coal a total of how many tons
- 6. A pile of coal was burnt out in two days. Two fifths of the coal was burnt in the first day, and two fifths of the coal was burnt in the second day. How much more was burnt in that day?
- 7. A transport team transported a pile of coal. On the first day, it transported 2 / 7 of this pile of coal, and on the second day, it transported 2 / 5 of the first day. The remaining 42 tons were just transported out on the third day, How many tons isn't that for you?
- 8. A pile of coal has been transported 2:5. If 50 tons are being transported, the remaining coal will be 30 tons less than that already transported. How many tons of coal is the original pile of coal
- 9. There are two piles of 120 tons of coal, 20 tons from the first pile and 1 / 3 from the second pile. At this time, the weight of the two piles of coal is equal. How many tons are the two piles of coal? The whole process of solving the equation [(╯▽) thank you very much, for primary school students to understand!
- 10. There are two piles of coal. The first pile carries away 14 tons, and the second pile carries away part of the coal, leaving 60%. The weight ratio of the remaining first pile and the second pile is 3:5?
- 11. A pile of sand weighs four tons. Two fifths of the sand was carried away in the first time. How many tons were carried away in the second time?
- 12. There are three fourths of tons of coal in the canteen. Two fifths of them are used. How many tons are left?
- 13. There are three fourths of tons of coal in the canteen, two fifths of which are used. How many tons are left?
- 14. There are 48 apples in three piles. First, take out the apples equal to the number of the second pile from the first pile and merge them into the second pile; then take out the apples equal to the number of the third pile from the second pile and merge them into the third pile; finally, take out the apples equal to the number of the first pile from the third pile and merge them into the first pile
- 15. 34 of number a is equal to 25 of number B. number a is 80 and number B is 25______ ．
- 16. Two fifths of a pile of coal was used in the first time, and three eighths of it was used in the second time. There are 180 kg left. How many kg of this pile of coal Using the equation solution,
- 17. A pile of coal, the first transport away two fifths, exactly 60 tons, the second transport away one fifth of the remaining coal, how many tons are left
- 18. Two granaries coexist with 1800 tons of wheat. If 400 tons are transported from warehouse A, the weight of the remaining wheat in warehouse A is just 34 times that of warehouse B. how many tons of wheat were stored in warehouse B?
- 19. There is a pile of sand. It takes 36 cars to transport by car a and 45 cars by car B. It is known that each car of car a transports 1.5 tons more than that of car B. how many tons of sand is there?
- 20. There is a pile of coal, if you use a car to transport it all at once, you need 36; if you use B car to transport it all at once, you need 45. It is known that a car transports 1.5 tons more than B car. How many tons of this batch of coal are there in total? A simpler way to do it