Question

1. In one brand of frozen dinner, there are 22 grams of fat. Each gram of fat is 9 calories. Each frozen dinner has 945calories. What percent of these calories is from fat?

Answer 1

There are 22 grams of fat and each gram of fat is 9 calories, then

$22\text{ grams }\cdot9\frac{calories}{gram}=198\text{ calories from fat}$

945 calories represents 100%, then 198 represents:

$\begin{gathered} \frac{945\text{ calories}}{198\text{ calories}}=\frac{100\text{ \%}}{x\text{ \%}} \\ 945\cdot x=100\cdot198 \\ x=\frac{19800}{945} \\ x=21\text{ \%} \end{gathered}$

21% of the calories are from g