when david is twice as old as he is now he will four times a

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when david is twice as old as he is now he will four times as old as his daughter Jane will be in five years time .If in 1990 ,four years ago,he was four times as old as his daughter ,in what year was she born?

这是2010年NECCS试题：
翻译：
当david的年龄是现在年龄的两倍的时候,他的年龄是他的女儿jane五年后年龄的四倍.如果在1990年（四年前）,他的年龄是他女儿年龄的四倍,jane是什么时候出生的?
1983年令现在david年龄x,他的女儿jane的年龄y,则2x=4(y+5)对吧?因为现在是1994年（而不是2010年）,所以根据第二句话有：x-4=4(y-4),则根据以上两个方程求出y=11,x=32 则在1994年也就是现在他爸爸34岁,他女儿11岁,则女儿出生在1983年

when david is twice as old as he is now he will four times a when David is twice as old as he is now he will be four time 一到英语竞赛智力题,When David is twice as old as he is now he will be 一个英语竞赛智力题When David is twice as old as he is now he will be the man is now twice as old as the woman was when he was old Fred is 24 and twice as old as Ginger was when he was as old that's easy,Bob is twice as old as jack,so he is now thirty. Jsck is twice as old as Jill,but in five years time he will Jack is twice as old as Jill ,but in five years time he will my grandma is 84.she is four times as old as am .how old am Mary,who is sixteen yeas old,is four times as old as her bro Jack is twice as old as Jill,