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As long as the slope of the bottom is constant and continuous, with no flats

or sudden drop-offs, we can treat the whole pool as if its depth is the average

of 3-ft and 8-ft = 5.5-ft.

Volume = 20 x 40 x 5.5 = 4,400 cubic feet = 32,914.3 gallons (rounded)

Note that this is the volume of the pool, not necessarily the amount of water in it.

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Q: How many gallons in a pool 20 foot by 40 foot 3 foot shallow end and 8 foot deep end?
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