Let son's age be S

Then father's is: 3S - 15

Mother's is: 2S

We then get: S + 3S - 15 + 2S = 135

Solve to find S, the son's age.

Multiply S by 2 to get mother's age.

Subtract sum of son's and mother's ages from 135 to get father's.



It is that SIMPLE....nothing complex!! 

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