Problem Solving (PS) | Re: A closed cylindrical tank contains 36pi cubic feet of water

A closed cylindrical tank contains 36pi cubic feet of water and is filled to half its capacity. When the tank is placed upright on its circular base on level ground, the height of the water in the tank is 4 feet. When the tank is placed on its side on level ground, what is the height, in feet, of the surface of the water above the ground?

(A) 2
(B) 3
(C) 4
(D) 6
(E)9

Notice that some editions of OG have a typo saying that the height of the water in the tank is2 feet, it should read "the
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