If the puddle is square, then its volume is (20) x (20) x (1/12) cubic feet.
(331/3 cubic feet) x (62.4 pounds/cubic foot) = 2,080 pounds of water in the puddle.
If the puddle is not a 20' x 20' square, then this calculation doesn't work, and
you'd need more information to determine its true surface area (and volume).
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