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You will need 3 to 4 gallons of coleslaw to feed 100 people. It  will take one pound of cabbage for every 5 people.
Multiply 4 oz. by 70 to determine how much coleslaw you need. According to the Great Party Recipes website, you should figure 3 or 4 oz. of coleslaw per person. Multiplying 70 by 4 equals 280. Divide 280 oz. by 16 to get 17.5 lbs. of coleslaw.