solve this formula for f

Question

A serving off yogurt contains 120 calories, 21 grams of carbohydrates ,and 5 grams of protein,How much fat is provided by this serving (to the nearest tenth of a gram)?

Answer 1

Hello Leo

 

Both protein and carbohydrates provide 4 cal/gram of energy while fat provides 9 cal/gram.

 

Calories from carbohydrates = 21 g x 4 cal/g = 84 cal

 

Calories from protein = 5 g x 4 cal/g = 20 cal

 

Next, let’s calculate the # of calories from fat.

 

carbs + protein + fat = 120 cal

 

84 + 20 + fat = 120

 

fat = 120 - 104 = 16 calories

 

# of grams of fat = 16 cal x (1 g / 9 cal) = 1.8 g (rounded to the nearest tenth).