A US gallon is 16 cups, so 1/3 of a gallon is 16/3 = 5 1/3 cups.
2/3 gallon is twice as much which is 10 2/3 cups.
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2/3s of what? gallon, pint, quart, liter?
One third plus one third equals two thirds.
1 gallon = 16 cups 1 cup =0.23 gallon
1.37 gal 1 gallon = 16 cups 1 cup =0.23 gallon
1 cup and 1/3