help, I got a question wrong in chem class, and I can't figure it out, can someone please help?

Question

How many calories are in 5 large eggs if one egg contains 6 grams of fat and 6 grams of protein?

Carbohydrate = 4kcal/g

Fat= 9kcal/g

Protein = 4kcal/g

Answer: a) 400 cal

b) 4 cal

c) 80 cal

d) none of the above

it was not 80 cal because that is the one I chose and it was wrong

Answer 1

First, your values can't be correct, because there are 4 calories/g of protein and 9 calories /g fat. Your kcal might mean Cal (cap C). That being the case we proceed as follows:

Let's first find calories in ONE egg:

6 g fat/egg x 9 cal/g 54 cal/egg

6 g protein/egg x 4 cal/g = 24 cal/egg

Adding them up we have 54 + 24 cal/egg = 78 cal/egg

78 cal/egg x 5 eggs = 390 cal

Answer = (a) 400 based on 1 significant figure

Answer 2

You only calculated the kcal for one egg. You have 6 grams of fat and each grams produces 9 so we have 54 kcal. The protein content is 4 kcal/gram so 6 grams is 24 kcal and you have 78 kcal/egg X 5 eggs=390 kcal or 400 kcal as the answer given.