To answer this question, we need to know that 1 quart is equal to 4 cups.
Then, we need to do this conversion as follows:
1. We have a mixed fraction, and we need to convert it into an improper fraction:

2. Then, we have that 1 quart is equal to 4 cups:

Therefore, 3+3/4 quarts of coffee is equal to 15 cups of coffee.