英語智力問答:花錢買生日禮物

字號(hào):

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?
    $25
    $30
    $46
    $62
    答案是$62。做這道題時(shí),解題要點(diǎn)就是----Johnny最后一次花的錢就是他身上所剩的錢,假設(shè)他最后一次剩余X塊錢。那么我們可以列出方程式:X/2 + 1 = X,這樣就能解出X=2,依次往前類推,可以得出第一次的前是62塊。