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商店賣糖果
一個糖果有一個糖果紙
一個糖果1元
現在商店在作促銷
3個糖果紙可以換1個糖果
請問
15元最多可以吃幾個糖果？
A store sells candy. Each piece of candy has one candy wrapper. Each piece of candy costs $1. Right now, the store is having a promotion. You can trade 3 candy wrappers for one piece of candy. What is the most candy you could eat for $15?
PS. 其實是數學問題，但我放在英文教學，反正有英文翻譯嘛!哈哈。
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