That would be 2.5 pounds.
if i knew i would not have to ask
{| |- | 4 lbs. of white potatoes will make approximately 8 cups of cubed potatoes. On average, 1 lb. of white potatoes = 3 med. potatoes = 3 cups grated potatoes = 2 cups cubed potatoes = 1-3/4 cup mashed. |}
One pound of of white or russet potatoes makes approximately 1 3/4 cups of mashed potatoes. Using that measurement, then five pounds of potatoes would make approximately 8 3/4 cups of mashed potatoes. Source: http://southernfood.about.com/library/info/blequivp.htm
I would use 40 pounds.
If mashed after cooking, approximately 8 cups.
well! you need 6 cups to make 3 servings
Since 6 cups of water weighs 3 pounds, and potatoes are close to the same specific gravity as water, if you totally stuffed potatoes into the cups, they'd be about 3 pounds also. However if you're cubing them or shredding them etc. there's going to be some air there as well, so depending on what you're doing and how tightly packed I'd guess 2.5-3 pounds... Vaguely scientific answer ;)
That is approximately 2.2 cups of potatoes
A peck of potatoes weighs about 10 pounds, this is about 8 quarts or 16 pints US dry measure. so a cup which is a liquid measure is about 7/8 of a dry half pint, or about .27 pounds per cup of whole potatoes. The volume of potatoes can be reduced by chopping or grating them. So that 1 cup of potatoes weighs about 3/4 pound grated or about 1/2 pound chopped. So 1 lb of chopped potatoes is about 2 cups more or less, and 1 1/2 cups or so if grated. The type of potato will change these measurements a bit.
If you mashed it, it would be 2 cups.
One pound of potatoes yields about three cups of peeled & sliced potatoes.
Are they having other vegetables. If so, then about 18 pounds of potato.