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If we assume that the bottom of the pool is a flat surface, then its average depth is 6.5 feet. Its capacity is therefore: 6.5 x 4 x 9 = 5200 cubic feet. The number of gallons to which this is equivalent depends on the type of gallon. There are about 6.23 Imperial UK gallons to the cubic foot, yielding an answer just short of 32390. However, there are 7.48 U.S. liquid gallons per cubic foot, and this gives us a figure of nearly 38899.

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Q: If the depth of a 40ft by 20ft rectangular pool varies from 9ft at the deep end to 4ft at the shallow end how many gallons of water will fill it?
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