Jack is 15 years old,three times as old as his sister.How ol

问题描述：

Jack is 15 years old,three times as old as his sister.How old will Jack and his sister be when he is twice as old as his sister?
1个回答 分类： 英语 2014-11-12

问题解答：

我来补答
Jack is 15 years old, three times as old as his sister.
So his sister is 5 years old.
How old will Jack and his sister be when he is twice as old as his sister?
Jack will be 20 years old and his sister 10 years old.
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