A tank is full of water. Find the work required to pump the water out of the spout. Use the fact that water weighs 62.5 lb/ft3. (Assume a = 8 ft, b = 14 ft, and c = 15 ft.)

Answer 1

and what are a,b,c supposed to be?
In any case, find where the center of mass is, and how far it is from the top. If that distance is d, then
work = weight * distance = volume * 62.5 * d
Or, you could always set up and integral, but that will yield the same answer.