I would make 3.5 pounds
25 pounds should be plenty.
Since 25 pounds feeds 100, you'll need 106 1/4 pounds of potato salad.
A standard serving of mashed potatoe's is around six ounces. Between five and six pounds should be enough to serve 10 adults and maybe even leave you a little bit of leftovers.
you would be safe with 4 or 5 ounces per person
About 50 pounds should do it
7 pounds
If you are making mashed potatoes from raw potatoes, generally one potato per person. If you are using instant potatoes, then figure one cup of cooked potatoes per person.
~27.34
It depends what else they are having. If a 3 veg and meat dinner, I would serve 4 oz au gratin per. -This will take 50 pounds potato.
If you are making the potato salad, start with the potatoes. 25 pounds of potatoes will make moderate servings for 100.40 pounds will make generous servings for 100, but can easily serve 120.If the potato salad is pre-made, you will need 4 to 4 1/2 gallons to serve 100.
only 1kg is enough for 3 peoples
To serve 300 people, you will need about 9.375 gallons of potato salad. This is based on one gallon being 16 cups, so, if you figure 1/2 cup per serving, one gallon should serve 32 people.