Hi

Let x and y represent  Dad's and Son's ages   

Question States***

x + 12 = 3(y+12), x = 

  x - y = 30          |Substitute for x

 (3y+24) - y = 30

    2y = 6

     y = 3, age of son.  Dad is 33  

CHECKING our answer***in 12 years...

  45 = 3•15

Wish You the Best in your Studies.

 

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