Question: how many gallons of water can fill a pool that is 50 yards by 20 yards?
Answer: 1 Expert Answer. Hi Niki, the volume of a rectangle is given by: V = L * W * H, where V is the volume, L is the length, W is the width, and H is the height. To find the gallons of water, multiply the volume, 81000, by 7.5, or 607,500 gallons.