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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?
2 / 7 × 2 / 5 = 4 / 35 of the coal was transported the next day
So this pile of coal has 42 (1-2 / 7-4 / 35) = 70 tons
After a part of the coal has been transported away, there are 2 / 5 tons left, which is exactly the 2 / 5 tons transported away. How many tons have been transported away? How many tons are there in total?
Transport 2 / 5 △ 2 / 5 = 1 ton
Total 1 + 2 / 5 = 7 / 5 = 1.4 tons
There are 150 tons of coal in a coal plant, and 50 tons are transported away. How many parts of these coal are transported away? How many parts are left?
50 △ 150 = 131-13 = 23 A: 13 is taken away, and 23 is left
A pile of coal carries 50 tons more than three fourths of the total, and the rest is 100 tons less than two fifths of the total. How many tons of coal does this pile have?
If the original XT is set, then 3 / 4x + 50 is carried away
x-（3/4x+50)=(3/4x+50)*2/5-100
1/4x-50=3/10x+20-100
x=600t
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