Question 410525
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Hi
Paul is 12. His father is 33
Let x represent How many years ago was the father 4 times as old as the son? 
Question states*** 'x' years ago...
   33-x = 4*(12-x)
  Solving for x
   33-x = 48 - 4x
        3x = 15       
           x = 5, the years ago the father was 4 times as old as the son        
CHECKING our Answer***
  33-5 = 28 = 4*(12-5)