Question

question 9
a goal is to get at least 10% of daily calories from polyunsaturated fats as are found in various nuts, oils, and fish. one serving of walnuts (about 15 pieces) has about 20 grams of polyunsaturated fat. each fat gram has 9 calories. about what percent of daily calories does one serving of walnuts provide, assuming a 2,000 - calorie diet?
a 1%
b 9%
c 18%
d 4.5%

Explanation:

Step1: Calculate calories from polyunsaturated fat

Each gram of fat has 9 calories, and one serving of walnuts has 20 grams of polyunsaturated fat. So the calories from polyunsaturated fat are $20\times9 = 180$ calories.

Step2: Calculate the percentage of daily calories

The daily diet is 2000 calories. To find the percentage, we use the formula $\frac{\text{Calories from fat}}{\text{Daily calories}}\times100\%$. So $\frac{180}{2000}\times100\% = 9\%$.

Answer:

B. 9%