A pipe is leaking at 1.5 cups per day. About how many gallons per week is it leaking?

First, 16 cups are equal to a gallon. First, you multiply 1.5 cups by 7, to get you the number of cups a week, which is 10.5 cups. Then, you divide that by 16, to get the number of gallons, in which case is 0.65625 gallons.