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a marketing firm determined that, of 200 households surveyed, 80 used neither Brand A nor Brand B soap, 60 used only brand A soap, and for every household that used both brands of soap, 3 used only brand B soap. How many of the 200 households surveyed used both brands of soap?
(for every household that used both brands of soap, 3 used only brand B soap.)不太理解这句话,答案解析里面给的是 用B是 用A和B的三倍。新手刚开始准备,想知道这个是GMaT很常用的一种表达吗? |
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