Calculate the total kilocalories available from protein, fat, and carbohydrate in 300 g of dry food that contains 20 % protein, 30 % fat, 40 % carbohydrate and 10 % fibre.
Answer
1530 kcal
The correct answer is 1530 kcal — Add energies: 240 + 810 + 480 = 1530 kcal
Step-by-step solution
- Find mass of protein = 0.20 × 300 g = 60 g
- Find mass of fat = 0.30 × 300 g = 90 g
- Find mass of carbohydrate = 0.40 × 300 g = 120 g
- Compute energy from protein = 60 g × 4 kcal/g = 240 kcal
- Compute energy from fat = 90 g × 9 kcal/g = 810 kcal
- Compute energy from carbohydrate = 120 g × 4 kcal/g = 480 kcal
- Add energies: 240 + 810 + 480 = 1530 kcal
Common mistake: Using wrong calorific values for macronutrients or counting fibre calories
Concept tested: Energy contribution of macronutrients
Published · How this solution was prepared and checked
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