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I poured half a bucket of oil in the first and second grades of Olympic Mathematics in primary school. How much does the oil and barrel weigh?
Supplementary topic: second grade math problem: A barrel of oil weighs 90 kilograms. After pouring half of the oil, the connected weight is 50 kilograms. How much does this bucket weigh? How much is the gas?

Answer:

90-50=40

Half a barrel of oil is 40 pounds

Then a barrel of oil is 80kg.

Barrel 10kg.

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