Answer:
Yubin can make 168 cookies.
Explanation:
15 3/4 as a decimal is 15.75. 2 1/4 as a decimal is 2.25. 15.75 divided by 2.25 is 7. You would then do 7 times 24 because that's how many cookies 2.25 cups of flour makes, and you get 168. Your answer is 168 cookies.