Without knowing what kind of dish you are serving the red beans in, this will be an estimate.
For straight red beans, served as a side dish, you can estimate that each person will eat approximately 1/2 c of beans. For 150 people, this is 75 cups. Each can tends to have about 1 cup worth of beans in it, so you would need 75 cans of red beans.
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3 should do it. For the last 2 years I have made the green beans for the church Thanksgiving dinner. We feed 300 and I made fresh and canned bean casseroles. I used 8 pounds of fresh beans and 2 cans, so 3 cans should be plenty for you.
he typical serving size is 1/2 cup. Some people will have more, some less. Assuming 1/2 c is average, and considering that there are 16 cups in a gallon (two in a pint, 4 in a quart, 8 in a half gallon and 16 in a full gallon), each gallon of green beans will yield 32 servings. Therefore, 4 gallons of green beans will be enough for about 128 people and should be fine, especially if you are serving other sides. If you think they will eat more green beans than average then 5 gallons will feed 160.
Well. In my family, 2 of us can eat happily off 1 tin of baked beans, so I'd say you'd need about 125 cans.