There is another way to think of and solve this problem. You are starting out with 4 gal and 1 qt and you need to take away 1 gal and 3 qts. Start by taking away 1 gal from 4 gal 1 qt and you are left with 3 gal 1 qt. Then, you need to take away 3 qts. To do that, think of it as borrowing. You know that there are 4 qts in a gal. So, "borrow" 4 qts from the three gal. That leaves you with 2 gal and, when you add the 4 borowed qts to the one that is there, you have 5 qts. Now you can subtract 3 qts from the 5 qts and are left with 2 gal and 2 qts. 2 qts are equal to a 1/2 gal so in simplest form, the answer is 2 and 1/2 gal.
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