[分享] 是誰少給了一塊錢(三人投宿)
餐廳內有三個人拿到一個帳單,帳單上寫者總共25元
三個人給服務生30元,服務生找他們5元
三個人拿走3塊錢,其中給2塊錢當小費
這時三個人分別各付九塊錢,總共為27元,服務生得到兩塊錢小費
27+2=29,不過他們總共給服務生三十元
所以少了一塊錢,誰騙了誰
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