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奇怪的数学题

2010-04-08 08:45:19| 分类：默认分类 | 标签： |举报 |字号大中小订阅

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有3个人去投宿, 一晚30元。三个人每人掏了10元凑够30元交给了老板，后来老板说今天优惠只要25元就够了, 拿出5元命令服务生退还给他们。服务生偷偷藏起了2元, 然后, 把剩下的3元钱分给了那三个人, 每人分到1元。这样, 一开始每人掏了10元, 现在又退回1元, 也就是10-1=9, 每人只花了9元钱, 3个人每人9元, 3 X 9 = 27元 + 服务生藏起的2元=29元，还有一元钱去了哪里？？？

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