算算术

  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,
拿出5元命令服务生退还给他们,服务后偷偷藏起了2元,然后把剩下的3元分给了三个人,这样一来也就是说每人只花了9元钱,3个人每人9元3×9=27
元,加上服务生藏起的2元等于29元,还有1元钱去了哪里?
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