英语选择题含答案 花钱买生日礼物

Grandma sent Johnny some money for his birthday. Johnny spent all of it in five stores. In each store, he spent $1.00 more than half of what he had when he came in. How much money did he get from grandma?

查看答案 答案是$62。做这道题时,解题要点就是----Johnny最后一次花的钱就是他身上所剩的钱,假设他最后一次剩余X块钱。那么我们可以列出方程式:X/2 + 1 = X,这样就能解出X=2,依次往前类推,可以得出第一次的前是62块。

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