The nutrition facts label for product a lists 300 calories per serving product b lists 500 calories per serving. The serving size listed on the nutrition facts label is 1/2 cup for product a and 1 cup for product b. Which ice cream has fewer calories?

The answer is project B has fewer calories. To get this answer you have to look at the serving size. Product a serving size is 1/2 of a cup. If you multiply the calories by two to get the full cup, you get 600 calories. So one cup each of the products A and B will show you that product B has fewer calories.