问答题When David is twice as old as he is now he will be 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?
问答题
When David is twice as old as he is now he will be 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?
参考解析
解析：
（由题目可知，四年前为1990年，则今年为1994年。可以设David的女儿今年为X岁，David为Y岁，根据题目条件可以列出一个两元一次方程组：4(X+5)=2Y; 4(X-4)=Y-4。解方程组可得：X=11，Y=32，即Jane今年11岁，又知今年为1994年，则1994-11=1983，即她出生于1983年。）
（由题目可知，四年前为1990年，则今年为1994年。可以设David的女儿今年为X岁，David为Y岁，根据题目条件可以列出一个两元一次方程组：4(X+5)=2Y; 4(X-4)=Y-4。解方程组可得：X=11，Y=32，即Jane今年11岁，又知今年为1994年，则1994-11=1983，即她出生于1983年。）
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