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.
8-10 heads of lettuce depending on how much lettuce you use
One head of lettuce should feed 8-10 people, so for 50 people factor 5-6 heads of lettuce.
13 pounds
1 cut into little pieces
8 for tomatoes and 4 lettuce heads
a billion
For a gathering of 22 people, you would typically need about 2 to 3 heads of romaine lettuce, depending on the size of the heads and how the lettuce will be served (as a salad or as part of a larger dish). If each person is expected to have a generous serving, aim for 3 heads. If it’s a side salad or part of a mixed dish, 2 heads should suffice. Always consider the appetite of your guests and any other dishes being served.
if it's only lettuce, then 35 heads ish. could be less. depends on the lettuce, what you're making and how hungery the people are.
28 = (70 / 5) * 2
100... rabbits? kids? zombies?
about 17.1 million tacos are wasted per year from being thrown at people.
I take issue with the notion of "too many tacos." For what? For whom? 15.