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How much money did he get from grandma?

智力题 2017-04-09 英语智力题 网络整理

  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?

  $7.50  -  $25  -  $30  -  $46  -  $62

答案:$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。

TAG: Howmuchmoney

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