Question 422330
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Hi
A father is now three times as old as his son
Let x and 3x represent the ages of the son and father NOW repectively
Question states*** 12years ago...
 3x-12 = 6(x-12)
Solving for x
 3x-12 = 6x - 72
     60 = 3x
     20 = x, son's age now.  The father is now 60.

CHECKING our Answer***12years ago...
   48 =  6*8