You will need about 1 pound of potatoes per every 3 people.
I would use 40 pounds.
I would use 25 pounds of potato
I would make 3.5 pounds
I would do 4.5 pounds of potaato
You need one and 1/4 potato per person, so: - serving 4 people,= 5 potatoes - serving 10 people,=12 - 13 potatoes.
To make cheesy potato casserole most recipes require about 2 pounds of potatoes to feed 8 people. If you are feeding 150 people the recipe would need to be made 19 times over and require 38 pounds of potatoes.
Are they having other vegetables. If so, then about 18 pounds of potato.
I would use 40 pounds and cook them cut in halves in 2-3 large pots
That would be 2.5 pounds.
It depends what else they are eating. If a normal 3 veg and meat meal, then about 25 pounds of potato.
I would make 38-40 pounds
you would need about 10,000lbs of tato to feed that many booties