The area of a trapezoid is $80$. The length of one base is $16$ units greater than the other base, and one base of the trapezoid is $12$. Find the length of the median of the trapezoid.
Median length will be ( 12 + 12+16) / 2 = 20 units
As an aside, the height can be found by
area = median length * height
80 = 20 h
h = 4 units