A clerk sold 3 pieces of one type of ribbon to different customers. One piece was 3 20/27 yards​ long, another was 6 3/5 yards​ long, and the third was 11 1/9 yards long.

Question

What was the total length of that type of ribbon​ sold?

Answer 1

3 20/27 + 6 3/5 + 11 1/9

=3+6+11 + 20/27 + 3/5 + 1/9

= 20 + 100/27(5) + 81/27(5) + 15/9(15)

= 20 + (100+81+15)/135

= 20 +196/135

=20 + 1 +61/135

= 21 + 61/135

= 21 61/135 yards total length

or

try putting them all in decimal form, the add them

3 20/27 = 3.74074074...

6 3/5 = 6.6

11 1/9 = 11.111...

sum = 21.45185185185...

= 21 61/135 yards total length