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If I had 256 fluid ounces of juice how many half gallons would I have?
You would have ##4## half gallons.
##128## US Fluid Ounces are equal to one Gallon.
As ##256=128xx2## fluid ounces are equal to ##2## gallons.
Now each gallon has two half gallon, so ##4## half gallons in ##2## gallons or ##256## fluid ounces.