Answer:
16.2 in.
Explanation:
Vol. of cylindrical tank = Bh, where B is the area of the base
Since the base is a circle, B =

r = 18.5/2 = 9.25 and let's use 3.14 for π
So. 4356 =

= 268.66625h
h = 4356/268.66625
h = 16.2134... = 16.2 in to the nearest tenth of an inch