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题目:有一桶纯酒精,从中取出8升后以水补满,又取出混合酒精4升,再以水补满,于是,桶中的酒精与水的比为18:7.求桶的容积.
Title: There is a bucket of pure alcohol. After removing 8 liters from it, it is filled with water. Then 4 liters of mixed alcohol is taken out and filled with water. The ratio of alcohol to water in the bucket is 18:7.