Arecipe calls for 2 cups of flour to make 24 cookies. write and solve a proportion to find how much flour is needed to make 54 cookies.
my 4.5 because 54 divided by 24 is 2.25 and 2 x 2.25 is 4.5

For the answer to the question above,
when you put it into a proportion it would be 2/24 = x/54  
multiply 2 and 54 which equals 108 
and multiply 24 and x which equals 24x
so you have 24x=108       divide 24x by 24 so you have x standing alone but what you do to one side you have to do to the other so divide 108 by 24 and get 4.5 which is 4 1/2 cups of flour. 
So the answer is 2/24 = x/54; x = 4 1/2 cups

Letter a i would say