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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.
Here's how I make mine. Combine a one pound package of tri-color coleslaw mix with one cup of chopped Vidalia onions and a half cup of chopped green, sweet bell pepper in a large, lidded bowl. Bring dressing ingredients - vinegar, oil, sugar, salt, celery seed, dry mustard and black pepper - to a boil in a saucepan. Pour the hot dressing over the coleslaw mix 1/3 at a time, stirring in between. Cover and refrigerate for 24 hours. Toss again and let come to room temperature before serving.