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There is a pile of coal that consumes 1 / 5 of the total amount in the first time, 3 / 10 of the total amount in the second time, and the total amount in the second time is more than that in the first time The () of the total is shared twice, and the () of the total is useless
There is a pile of coal that uses 1 / 5 of the total amount in the first time, 3 / 10 of the total amount in the second time, 1 / 10 of the total amount in the second time, 1 / 2 of the total amount in two times, and 1 / 2 of the total amount left unused
For a pile of coal, first one fifth of the total amount is used, then one fifth of a ton is used, and then one fifth of a ton is left. How many tons of coal does this ton have
1 / 5 + 1 / 5 = 2 / 5 (ton) 2 / 5 △ (1-1 / 5) = 1 / 2 (ton) a: this pile of coal is 1 / 2 ton
For a barrel of oil, take out 15 kg for the first time, and take 1 / 4 less than the first time for the second time. At this time, there are still 3 / 8 of the total. How many kg is the barrel of oil
There are (15 + 15) / (3 / 8 + 1 / 4) = 30 / 5 / 8 = 48 kg
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