well if she drinks .5 g's (gallons) a day that's 8 cups a day because a gallon is 16 cups so half a gallon is 8 cups. so to find out how many cups in a week. so 8 cups a day times 7 because there are 7 days in a week. its 8 x 7 = 56.
s.a: 56 cups in a week
