Jane consumed a breakfast that contained 85 grams of carbohydrate, 20 grams of protein, and 18 grams of fat. how many kilocalories did jane eat at breakfast?
a. 152 kilocalories
b. 1,007 kilocalories
c. 123 kilocalories
d. 582 kilocalories

d. 582 kilocalories

Explanation:

To know how many calories Jane ate for breakfast, we need to make a very simple calculation. But before calculating, we should know that 1 gram carbohydrate contains 4 calories, 1 gram protein contains 4 calories and 1 gram contains 9 calories.

Knowing this, we simply multiply and add as follows:

 (85x4 = 340) + (20x4 = 80) + (18x9 = 162) = 340 + 80 + 162 = 582 kilocalories.

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