6. Yogurty's sells 63 gallons of ice cream and yogurt a week. One-third of that is chocolate flavored. a) How many gallons of chocolate flavor do they sell a week? _
b) How many gallons are other flavors? _

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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

The additive identity is 0 because when you add 0 to a number, you get the identical number as an answer.a + 0 = a