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  3. Grandma sent Johnny some money for his birthday, Johnny spent all of it in five

Grandma sent Johnny some money for his birthday, Johnny spent all of it in five

游客2024-08-14  11
问题 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?
选项 A、7.5
B、30
C、46
D、62
答案 D
解析 Jonny生日时，奶奶给了他一些零花钱,Jonny在5个商店将这些钱花完了。在每家商店花的钱都比进店时的一半还多1元。那么奶奶给了Jonny多少零花钱?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，可以得出第一次的钱是 62块。
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