Question 41941
When you do age problems, always set up the variables NOW...
Let x be your age now and c be Chad's age now.  Thus
c + 3 = 3x and
x + 3 = (1/2)(c + 3)
now double the second equation and substitute and we get
2(x + 3) = c + 3 so that
2(x + 3) = 3x
2x + 6 = 3x
x = 6
c = 15