Mrs.Chou placed 45 cookies on a plate, and 36 of the cookies were chocolate chip. What percent of the cookies on the plate were NOT chocolate chip?
45 - 36 = 9
9/45 = 0.2 = 20%
To find out the percentage of cookies that were not chocolate chip, we need to calculate the ratio of the number of non-chocolate chip cookies to the total number of cookies on the plate.
First, we need to determine the number of non-chocolate chip cookies. We can do this by subtracting the number of chocolate chip cookies from the total number of cookies:
Total Number of Cookies - Number of Chocolate Chip Cookies = Number of Non-Chocolate Chip Cookies
45 cookies - 36 chocolate chip cookies = 9 non-chocolate chip cookies
Now, we can calculate the percentage using the following formula:
Percentage = (Number of Non-Chocolate Chip Cookies / Total Number of Cookies) x 100
Percentage = (9 / 45) x 100
Percentage = 0.2 x 100
Percentage = 20%
Therefore, 20% of the cookies on the plate were NOT chocolate chip.