When Ethan had 7 friends over, the total number of people eating the pizza is 1+7 = <<7+1=8>>8 people.
If each person had 5 slices of pizza, the total number of slices eaten is 5*8 = <<5*8=40>>40 slices.
If Ethan ordered cheese pizzas and mozzarella sticks for 8 people, the number of mozzarella sticks each person ate is 64-40 = 24 pieces. Answer: \boxed{24}.
Ethan had 7 of his friends over. He ordered cheese pizzas and mozzarella sticks for the 8 of them. In all, there were 64: pieces of food. If each person had 5 slices of pizza, find the number of mozzarella sticks each person ate.
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