Arecipe for 9 blueberry muffins calls for 1 cup of flour. the number of muffins that can be made varies directly with the amount of flour used. there are 2 and one third cups of flour available. how many muffins can be made?

1/3 of 9 is 3.  

With 1 cup of flour, you can make one batch. With 2 cups of flour, you can make two batches. With having an additional 1/3 cup of flour, you can make 3 more muffins from this. 

So with that, 9+9+3= 21 muffins.

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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