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【1】 Canteen shipped 4 / 5 tons of coal, burning some after the remaining 1 / 5, how many tons 【2】 Canteen transported 4 / 5 tons of coal, burned 2 / 5, burned 1 / 4, how many tons are left. [3] canteen transported 4 / 5 tons of coal, burned 2 / 5, burned 1 / 4, how many tons are left. [4] canteen transported 4 / 5 tons of coal, burned 1 / 4, how many tons are left. Quick, thanks, urgent, accurate
【1】 4 / 5 * 1 / 5 = 4 / 25 [2] 4 / 5 * (1-2 / 5) - 1 / 4 = 23 / 100 [3] 1 / 4 * (4 / 5-2 / 5) = 1 / 10, the remaining 4 / 5-2 / 5-1 / 10 = 3 / 10
[4] The rest is x + 1 / 4x = 4 / 5, x = 14 / 25
There is a pile of coal, one third of which is added to 16 tons in the first time, the remaining half is added to 10 tons in the second time, and 20 tons in the third time
How many tons of coal is there in this pile?
Because the last 20 tons were used for the third time;
The second time is (20 + 10) / (1 / 2) = 60 tons;
Before the first use, it was (60 + 16) / (2 / 3) = 114 tons
This is the weight of coal in the beginning
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