An archived questions was, "one serving of a particular food contains 16g of carbohydrates, 2g of protein, and 10 g of fats. approximately how many calories does it contain? " the archived answer was 300 calories.  how did you get this answer? shouldn't it be 162? (9 cal * 10g fat) + (4 cal * 16g carb) + (4cal * 2g protein)

Your answer of 162 is correct. The answer at link does not show any work or justification for the given answer. And since the normally allowed calories per gram for carbs and protein is 4 and fats is 9, your answer is correct and justifiable. Mind, the actual values using a bomb calorimeter are higher and the difference is attributed to the energy the body expends in digesting the food.

1. aspect is nothing really because the answer is right in front of your face