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1 gallon of water equals 5 pounds so 21 pounds of ice would equal 4 gallaons and 1 quart of water.

The above answer is incorrect, please read the following:

The maximum density of water occurs at 39.16 °F (3.98 °C). When water is cooled down to its solid form, ice. It expands to occupy 9% greater volume in this solid state, which accounts for the fact of ice floating on liquid water.

Water at its maximum density at 39 °F (4° C), weighs 8.3454 lb/gal. (US, liquid).

So the answer to the question:

21 divided by 8.3454 = 2.5164

So 21lbs of ice = @ 2 1/2 gallons of water at 39º F

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