A cup is 8 ounces, so ... two and a half.
Note that these are measuring cups. I have no idea what size your actual cups are; it could reasonably anywhere from about 6-16 ounces.
6.4 of them
There are 2.5 8 oz. cups in a 20 oz. glass. 20 divided by 8 equals 2.5.
That is about 20 cups.
40.
2.5 cups 1 cup = 8 ounces 1 ounce = 0.12 cup
20 ounces of water is 2.5 cups
20 cups
That is 20 cups
20 ounces is 2.5 cups. This is because each ounce is about 0.125 cups, so multiplied by 20 is a total of 2.5 cups.
20 cups of water is approximately 4.536 Kg
There are 128 fluid ounces in a gallon. Therefore, there are 6.4 20-ounce bottles in a gallon.
That is approximately 20 cups. imperial gallons to Canadian cups.