8 oz. to a cup measure, so 21 fl.oz. is 2 cups and 5 oz.
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1 pint equals 2 cups, so 12 fl oz is equivalent to 1.5 cups.
18 fl oz equals 2.25 cups.
40 fluid ounces is equal to 5 cups.
8 fl oz = 1 cup . . 64 fl oz = 8 cups
8 fl ounces = 1 cup 16 fl ounces = 2 cups . . 40 fl ounces = 5 cups