Since he uses 3 3/4 tablespoon of coffee to make 10 cups of coffee and we want to find the amount for one, we must divide 3 3/4 by 10.
3 3/4 = 15/12
15/12 divided by 10 = 15/12 * 1/10
15/12 * 1/10 = 15/120 = 1/8.
Your final answer should be 1/8 of a tablespoon. Hope this helps!