This would depend on how you plan to serve the Sandwiches. If you serve them on a plate with other foods, one plate per person, you would need 200 buns. It's always best to have extra, just in case you need them, so you would need about 10 extra.
If you plan on having your guests prepare their own sandwiches in a buffet-style setting, you should have at least 300 buns to allow for 50% of your guests to come back for a second sandwich.
If all your guests are adults and you really want to be on the safe side, have 400 buns to allow for seconds for everyone. You may end up with lots of extra buns, but you wouldn't have to worry about being embarrassed by running out of food and having unsatisfied guests.
That, of course, depends on how big you want the burgers to be.
To determine how many sandwiches to prepare for 400 people, a general guideline is to plan for about 1.5 to 2 sandwiches per person, depending on the event and whether other food is served. This means you would need approximately 600 to 800 sandwiches. It's always a good idea to adjust based on the specific crowd and the duration of the event.
50, typically you are going to want to plan for one sandwich per person. If the group is going to be hungry or if the sandwiches are going to be the primary food served, you might want to plan on having 75 sandwiches or maybe even 100 so everyone could have two.
alot
4 packages of fish fillet and 3 packages of buns
4 packages of fish fillet and 3 packages of buns
If you are planning on serving your guests one sandwich each, then you would need 120 sandwiches. In case some go back for seconds, a good medium would be 180 sandwiches. That would be enough sandwiches if half of your guests came for seconds. To be absolutely sure you have enough sandwiches, you could have 240, in case everyone came back for seconds.
30
6
For 200 people, you're better off going whole hog. Two hogs ought to be enough for 200 people to have two sandwiches each (so you might need three hogs!)
No, PBJ sandwiches do not need to be refrigerated after they are made as long as they are consumed within a few hours.
You don't mention whether this is for salad or for sandwiches. For side salads, you would need 12 to 14 medium size heads of lettuce for 100 people.