You buy tomatoes in 25-pound cases.

One batch of cobb salad requires 3 ounces of tomatoes.

How many portions can be made with one shipment

For a single 25 pound case you can make 133 servings, As a single pound of tomatoes equals 16 ounces; and 16x25 is 400, and when you divide that be 3 it turns into 133.3333333 - and goes on, but you round that down to 133 for your answer.