[請益] 男板板友有沒有興趣幫我解一點數學問題?
題目是這樣子:
小明去超市買飲料,正趕上超市有促銷活動,可以憑三個空飲料瓶換一瓶飲料,
小明有二十七個朋友,問小明最少買多少瓶飲料才可以一人一瓶飲料?
答案是買十八瓶。
可是我不太搞得懂,
因為我用十八瓶推回去好像只能滿足26個朋友的飲料,
請問一下板眾我的盲點在哪裡?
本人非理組,所以數學比較弱,
瞭解的人可以給一下詳解或提示嗎?
先在這裡說聲謝謝。
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