Final answer:
By calculating the calories provided by carbohydrates and proteins, and subtracting that from the total caloric intake, we divide the remaining calories by 9 to determine the avocado contains approximately 36.1 grams of fat.
Step-by-step explanation:
To calculate the grams of fat in one avocado that has 405 kcal, with 13 g of carbohydrate, and 7 g of protein, we use the nutritional values that proteins and carbohydrates provide about 4 calories per gram each, while fats provide about 9 calories per gram. First, we calculate the calories provided by carbohydrates and proteins: (13 g carbohydrate × 4 kcal/g) + (7 g protein × 4 kcal/g) = 52 kcal + 28 kcal = 80 kcal. Then, we subtract that number from the total calories to find the calories provided by fat: 405 kcal total - 80 kcal = 325 kcal from fat. Finally, we divide the calories from fat by the number of calories per gram of fat to find the grams of fat: 325 kcal ÷ 9 kcal/g = approximately 36.1 grams of fat.