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8 fluid oz is 1 cup, 2 cups is 1 pint, 2 pints is 1 quart, and 4 quarts is a gallon. So, 8x2x2x4=128 oz in a gallon. Divide that by two for half a gallon and you get 64 oz in half a gallon, not 72 oz.

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13y ago

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