Question 118151
Let's say Mrs. Maaza is x years old and her son is y years old.
So x=3y and x+12=2(y+12).  Now we have a system of equations to solve.
So plug 3y in for x in the second equation.  3y+12=2y+24 (using distribution).
Solving for y gives y=12.  So the son is 12 years old.  Let's check.  If he is 12, she is 3*12=36.  In 12 years, she will then be 48 and he will be 24, so it works:)