Quote: 4 gallons equals how many cups?
8 oz to a cup
2 pints to a quart
4 quarts to a gallon
4 gallon = 4 gallon * 4 quart/gallon * 2 pint/quart * 8 oz/pint = 256 oz
notice how all the units cancel each other out until you're left with oz at the end.
