Helen is twenty years old ,and her age is four times as much as Mary 's.When Helen 's age is twi...
问题描述：
Helen is twenty years old ,and her age is four times as much as Mary 's.When Helen 's age is twi...
Helen is twenty years old ,and her age is four times as much as Mary 's.When Helen 's age is twice as much as Mary 's ,how old Helen then ?
答
翻译：Helen20岁,她的年龄是Mary的4倍.当Helen的年龄是Mary的两倍的时候,Helen多少岁?
回答：Helen is 30 years old then.到那时Helen30岁