With flu season coming up, Kristen decides to make get-well-soon kits. She has 15 cans of chicken soup and 18 boxes of tissue, which she wants to use to make identical kits with no
materials left over. What is the greatest number of get-well-soon kits Kristen can make?

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