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Popular Word Problems >

A father is 4 times as old as his son. In 20 years, the father will be twice as old as his son.

Solution

A f a t h er i s 4 t im es a s o l d a s hi s so n . I n 20 ye a rs, t h e f a t h er w i ll b e tw i ce a s o l d a s hi s so n .

Solution

Boy^{'} s age is : 10

Father^{'} s age is : 40

Solution steps

Translate the problem into an equation:

4 x + 20 = 2 (x + 20)

Solve for

x, 4 x + 20 = 2 (x + 20) : x = 10

Find age

Boy^{'} s age is : 10

Father^{'} s age is : 40

Popular Examples

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.Tim is 5 years older than JoAnn. Six years from now, the sum of their ages will be 79.