Use rounding to estimate 10 4/5 + 8 9/10

a. 20
b.19
c.18
d.19 1/2

a.20

Explanation:
10 4/5 rounded is 11
8 9/10 rounded is 9
11 + 9 = 20

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