QUESTIONS 36–42 ARE BASED ON THE FOLLOWING PASSAGE.

20. A water tank is in the form of a right cylinder ontop of a hemisphere, both with a radius of 3 feet.If the tank currently has 170 cubic feet of waterin it, how high does the water level reach in thecylinder (from the top of the hemisphere)?4a.3 feet5b.2 feetc. 6 feetd.4 feet