Question 415700
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Hi
Mary's age is 3 times as old as her son
Let x and 3x represent the son's and Mary's age NOW respectively
Question states*** In 12 years...
 3x + 12 = 2(x+12) -1
Solving for x
    x = 24-1-12
    x = 11, son's age now.  Mary is 33
CHECKING our Answer***
  45 = 2*23 - 1