Three posters cost $9.60. at that rate, how many posters can you buy for $48?

9.60 divided by 3 gives you 3.20 so the posters are $3.20 each.
48 divided by 3.20 equals 15.
You can purchase 15 posters with $48.

48 divided by 9.60 = 5 
5 x 3 = 15 
you can by 15 posters for $48

Best answer that i found on yahoo ok   set :   x= length of 2nd piece in cm  x- 3= length of 1st piece in cm  x-4= length of 3rd piece in cm  then since you know they all came from the 20 cm ribbon you add them together and set them equal to 20x+ x-3 +x-4 = 20  3x - 7= 20  3x= 27  x= 9  the shortest piece is the third piece which is x- 4  x-4  9-4 = 5  the length of the smallest piece is 5 cm.  the other lengths are  9 cm  6 cm