Jeff's fish tank has a base that is a trapezoid, as shown. The bases of the trapezoid are 24 and 27 inches, and the height is 16 inches. The tank contains 21.9 gallons of water. To the nearest inch, how deep is Jeff's tank? (A gallon is 231 cubic inches.)
b1 = 24 inches
h = 16 inches
b2 = 27 inches
The tank is inches in height (Round to the nearest inch as needed)