How much money did he get from grandma?

　　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

　　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。