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班長買22瓶就OK了! 22+20÷4=27人喝過了 此時還有22-20=2+5=7個瓶子. 再換一瓶喝了此時有28人喝了. 7-4=3+剛剛換過的那個瓶子還可以再換一瓶 於是,第二十九個人也喝上了.
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