I do believe that in this particular case, the word's TRIPLE, not treble!!



With father's and son's current ages being x and y, we get: 

x = 3y ------- eq (i)

Also, x + 10 = 2(y + 10)______x + 10 = 2y + 20_____x - 2y = 10 ------ eq (ii)

3y - 2y = 10 ------ Substituting 3y for x in eq (ii)

Son's age, or 

x = 3(10) ------- Substituting 10 for y in eq (i)

Father's age, or  

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