Cranberry juice is made with a 16:3:1 ratio of water:sugar:cranberries. How much water,in gallons, how much water is needed in order to make three gallons of cranberry juice? Express your answer as a common fraction.
If we assume that sugar is measued in gallons too
water makes up 16 out of (16+ 3 + 1 = 20) , or 16/20 ths of the final product
3 gallons * 16 / 20 = 48/20 = 2 2/5 or 12 / 5 gallons