20％ of the total belongs to both A and B,
60% of B not A, then B is what percent of the total?
这题读得有点腾云驾雾，60% of B not A是什么意思，一点感觉都没有。请帮忙作者: kitten369 时间: 2003-1-8 03:42
60% of b not a, then 40% of b is a(which means both a and b), but 20% of total belongs to both a and b, so b/total =20%/40%= 1/2作者: steven.wei 时间: 2003-1-8 20:23
多谢，豁然开朗.其实不难，就是不知道当时为什么做不出来？
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