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A father is 9 times as old as his son. In three years, the father will be 6 times as old as his son.
How old is the son?

 Jun 1, 2022
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Let the son's age ==S

Father's age ==9S

 

9S + 3 ==6 [S + 3], solve for S

9S + 3 == 6S + 18

9S - 6S ==18  -  3

3S == 15

S ==15 / 3 == 5 years - the son's age.

 Jun 1, 2022

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