Seven years ago, Scott was 3 times as old as Kathy was at that time.If Scott is

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问题 Seven years ago, Scott was 3 times as old as Kathy was at that time.If Scott is now 5 years older than Kathy, how old is Scott?

选项 A、12.5
B、13
C、14
D、14.5

答案 D

解析题目问7年前,Scott的年龄是Kathy的3倍，如果Scott现在比Kathy大5岁,那么Scott现在多大?这是一道稍复杂的计算题,设Scott七年前的年龄为X,则有X+7-（1/3X+7）=5,由此可得X=7.5,再加上7即是Scott现在的年龄，所以该选14.5。

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