Lee can make 18 cookies with two cups of flour. How many cookies can he make with three cups of flour?
I want to find out how many cookies I can make per cup of flour, so I can multiply that by the number of cups I have. To do that, I can divide the total number of cookies by the total number of cups of flour. So I have 18 cookies divided by 2 cups of flour, which gives me 9 cookies per cup. Now I can multiply 9 cookies per cup by 3 cups of flour, and that gives me 27 cookies. 