The math problem is-

I am getting ready for Thanksgiving and need some help desperately! I would like some advice on cooking my turkey.
I bought a 16 1/2 pound turkey. Book says to cook the turkey for 20 minutes per pound if it is unstuffed and 25 minutes per pound of the turkey is stuffed. I plan on having a stuffed turkey.
If I want to eat at 1:00 PM what time should I put the turkey in? oh yes the cookbooks says to let the turkeys stand for 10 minutes after coming out of the oven.