36
24 is 100 percent
50 percent of 24 is 12
So 24+12=36
133.25 is the awnser for this question
It's just an equation, the number you're looking for is X, and then turn the words into an solvable equation with respect to X.
7X + 3 = 39 - 2X
9X = 39 -3 = 36
X = 4
