Amount of water leaked by the pipe per day = 1.5 cups Number of days in a week = 7 Then Amount of water leaked by the pipe in 7 days = (1.5 x 7) cups = 10.5 cups It is already given in the question that 16 cups = 1 gallon So 10.5 cups = 10.5/16 gallons = 0.65625 gallons = 0.66 gallons So the pipe is leaking about 0.66 gallons per week. I hope the answer comes to your help.