How much food will serve 300 people?

For 300 people, and an average of 15lbs per turkey with each person eating about 1¼ lbs, you would need about 25 turkeys. Here is my math:

1¼ pp X 300 people = 375 lbs.

375lbs/15lbs per turkey = 25 turkeys

Note: This is all theoretical; I do not know how much turkey 300 people will eat.