Apipe is leaking at 1.5 cups per day. about how many gallons per week is the pipe leaking?

So we first need to find a number of cups leaking in a week. Which is simple just multiply 1.5 by 7

1.5 x 7 = 10.5.
Now we convert by knowing how many cups are in a gallon. Since there are 16 cups in a gallon we divide 16 by our total. 
16/10.5 = about 1.5

So the amount of gallons leaked per week is 1.5