智力测试 Jack is 15 years older than his sister.How old will ...的答案是什么Jack is 15 years older than his sister.How old will Jack and his sister be when he is twice as old as his sister?

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智力测试 Jack is 15 years older than his sister.How old will ...的答案是什么Jack is 15 years older than his sister.How old will Jack and his sister be when he is twice as old as his sister?

智力测试 Jack is 15 years older than his sister.How old will ...的答案是什么Jack is 15 years older than his sister.How old will Jack and his sister be when he is twice as old as his sister?
智力测试 Jack is 15 years older than his sister.How old will ...的答案是什么
Jack is 15 years older than his sister.How old will Jack and his sister be when he is twice as old as his sister?

智力测试 Jack is 15 years older than his sister.How old will ...的答案是什么Jack is 15 years older than his sister.How old will Jack and his sister be when he is twice as old as his sister?
jack 30
sister 15

当Jack30岁的时候。他的妹妹十五岁，正好是妹妹年龄的两倍。

X+15=Y 2X=Y :X=15

他妹15岁，JACK 30岁时。
题目的意思是“JACK比他妹大15岁，当他几岁时年龄是他妹的2倍。

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