13...Correct !!!
14.
(x + 2 ) / 15 = 8 /10
(x + 2) / 15 = 4/5 cross-multiply
5(x + 2) = 15 * 4
5x + 10 = 60
5x = 50
x = 10
15. This one is a little tougher !!
9 /15 = [2x - 6] / 20 simplify
3/5 = 2[x - 3] / 20
3/5 = [x - 3] / 10 cross-multiply
30 = 5[ x - 3]
6 = x - 3
9 = x
