The correct answer for this question is "22 inches."
The formula of finding the area of a trapezoid is:
A = (b1 + b2) / 2 h
Given the area of 166.5 in^2, height of 9 in, b1 of 15
So,
166.5 = (15 + b2) / 2 9
333 = 9 (15 + b2)
37 = 15 + b2
b2 = 22
So the length of the other base is 22 inches.
