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A bucket pours gasoline into B bucket.
Suppose that the weight of b barrel of gasoline x kg is 2.5 times that of b barrel, and a barrel can be 2.5x kg.

According to the facts, if18kg gasoline is poured from barrel A into barrel B, barrel B is exactly 1.5 times that of barrel A. ..

1.5 *(x+ 18)= 2.5x- 18，x=45，2.5x= 1 12.5。

So A has 1 12.5 kg, and B has 45 kg.

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