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How many cups of lettuce, or what weight, would you purchase to make a green salad for 40?
Are you familiar with the tubs of spring mix at Costco? That would probably be the easiest way to go. Two of them should be fine, as I'm guessing you're also going to add some grape tomatoes, some multi-colored peppers, maybe some fresh corn. Make a good vinaigrette, and you should have something lovely to present!
I tend to have big salad eaters, so with tubs that size, I'd probably have to use 4. Wish I could tell you weight, but I usually eyeball heads of lettuce. A medium to large head should serve at least 4 - 6, depending on what else you're adding, as boulangere says, or how many other dishes you're serving. Also, is it dinner or lunch? Kids included in that number or no? etc. Also depends on type of lettuce - a large head of romaine would probably serve 6 or more, whereas a "large" head of butter lettuce only four or so.