SOLUTION: A boy is one-fifth of his father age. In three years time, the sum of their ages will be 72. How old are they now?
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Question 1193345: A boy is one-fifth of his father age. In three years time, the sum of their ages will be 72. How old are they now?
Answer by greenestamps(13200) (Show Source): You can put this solution on YOUR website!
Informally....
Since the sum of their ages 3 years from now will be 72, the sum of their ages now is 66.
We need to divide those 66 years into two parts in the ratio 5:1; their ages are 55 and 11.
Formally....
x = son's age now
5x = father's age now
x+3 = son's age 3 years from now
5x+3 = father's age 3 years from now
The sum of their ages 3 years from now will be 72:
ANSWER: The son's age now is x=11; the father's age now is 5x=55.
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