问题描述：
英语翻译
Jack is 15 years old,three times as old as his sister.How old will Jack be when he is twice as old as his sister?
快帮我翻译,急..
Jack is 15 years old,three times as old as his sister.How old will Jack be when he is twice as old as his sister?
快帮我翻译,急..
问题解答：
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