A chocolate chip cookie recipe calls for 15 cups of flour for 20 dozen cookies. How many cups of flour are needed for 144 cookies?
To solve this problem, I need to find the relationship between the number of cups of flour and the number of cookies. I can use the given information that 15 cups of flour make 20 dozen cookies, or 240 cookies. This means that one cup of flour makes 240/15 = 16 cookies. Therefore, to make 144 cookies, I need 144/16 = 9 cups of flour. 