Question 879941
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Hi
Let x and y represent  Dad's and Son's ages   
Question States***
x + 12 = 3(y+12), x = {{{3y+24}}}
  x - y = 30          |Substitute {{{3y+24}}}for x
 (3y+24) - y = 30
    2y = 6
     y = 3, age of son.  Dad is 33  {{{3+30}}}
CHECKING our answer***in 12 years...
  45 = 3•15
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