解答
解答
求解步骤
Represent the numbers with :
A.T.Q.:
流行的例子
A father is 4 times as old as his son. In 20 years, the father will be twice as old as his son.Rick is 10 years older than his brother Jeff. In 4 years, Rick will be twice as old as Jeff.Pat is 20 years older than his son James. In two years, Pat will be twice as old as James.Diane is 23 years older than her daughter Amy. In 6 years, Diane will be twice as old as Amy.John is four times as old as Martha. Five years ago, the sum of their ages was 50.