There are 8 ounces in a cup, 2 cups in a pint, 2 pints in a quart and 4 quarts in a gallon. That makes 128 ounces in a gallon US. In UK 20 ounces to the pint, 8 pints to the gallon = 160 ounces.
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A half gallon is equivalent to 64 ounces. Therefore, 72 ounces is more than a half gallon by 8 ounces.
A half gallon is equivalent to 64 fluid ounces.
You must mean fluid ounces (ounces are weights, fluid ounces are volumes). There are 80 fluid ounces in a UK half gallon. There are 63.999999 US fluid ounces in a US half gallon.
There are 64 ounces in a gallon, so half a gallon would be 32 ounces.
128 ounces in a gallon 128/2= 64 ounces are in a half gallon