SOLUTION: A boy is one-fifth of his father's age. In 3years time the sum of the boy's and father's age is 72. What is the age of both of them
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Question 1157205: A boy is one-fifth of his father's age. In 3years time the sum of the boy's and father's age is 72. What is the age of both of them
Found 2 solutions by josgarithmetic, greenestamps:
Answer by josgarithmetic(39620) (Show Source): You can put this solution on YOUR website!
b, the boy
5b, the father
The description:
steps
-------father
Answer by greenestamps(13200) (Show Source): You can put this solution on YOUR website!
Using logical reasoning and some simple mental arithmetic, instead of formal algebra (if a formal algebraic solution is not required!)...
The boy is 1/5 of his father's age --> the boy is 1/6 of the SUM of their ages; the father is 5/6 of the SUM.
The sum of their ages 3 years from now is 72 --> the sum of their ages now is 72-2*3 = 66.
The son's age is 1/6 of 66, which is 11; the father is 5/6 of 66, which is 55.
ANSWERS: 11 and 55
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