Normally about 1/2lb per person is what you end up with. Unless, of course, it's really good.
45 people
158,478
Twenty.
Ten
About 12 people if it is part of a 3 veg meal.
Just throw as much as you want in.
20-25 lbs
a lot
Depends on the size. If its about 25 lbs you need 2 turkeys.
I'd say about 150-200 maybe?
About 8 turkeys.
4.5 lbs per year in America, 6.7 in Germany.