Energy per Gram of Typical Macronutrients | ||
---|---|---|
Macronutrient | Food calories | Kiljoules |
Protein | 4.0 | 16.7 |
Fat | 9.0 | 37.7 |
Carbohydrate | 4.0 | 16.7 |
The table above gives the typical amounts of energy per gram, expressed in both food calories and kiljoules, of the three macronutrients in food. If the 180 food calories in a granola bar come entirely from $p$ grams of protein, $f$ grams of fat, and $c$ grams of carbohydrate, which of the following expresses $f$ in terms of $p$ and $c$?
Difficulty: Hard
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