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After two fifths of the oil is poured out, the whole barrel weighs 5.2kg; after three fifths of the oil is poured out, the whole barrel weighs 4kg?
(5.2-4) / (3 / 5-2 / 5) = 6kg
The weight of the barrel: 4-6 × (1-3 / 5) = 1.6kg
A barrel of oil weighs 60 kg. After pouring two-thirds of the oil, this is the total weight of the barrel and oil, which is 24 kg. How many kg does the barrel and oil weigh?
Oil weight: (60-24) △ 2 / 3 = 36 △ 2 / 3 = 36 × 3 / 2 = 54 (kg);
Barrel weight: 60-54 = 6 (kg)
How many kilos are left if you use one-half of a barrel of Oil 15 kilos
7.5
There is a barrel of oil. Two fifths of the oil is taken out in the first time. The oil taken out in the second time is 15 kg more than that in the first time. There is 25 kg oil left in the barrel. The whole barrel of oil weighs several thousand grams
x-2/5x-2/5x-15=25
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