If 3 pounds of potato-salad feeds 15 people, how many pounds would you need for 200 people?

We are given the data about the ratio of the number of pounds of potato-salad and the number of people that can be fed. In this case, the ratio is 3 pounds / 15 people or 1 pound of potato salad per 5 people fed. For 200 people, 200 people * (1 pound of potato salad per 5 people) is equal to 40 pounds of potato-salad