5 1/2 + 8 2/5 + 8 1/4=

First, get a LCD (Lowest Common Denominator).

5 1/2 * 10 = 50 10/20

8 2/5 * 4 = 32 8/20

8 1/4 * 5 = 40 5/20

Secondly, we add them all together.

50 10/20

32 8/20

40 5/20

Answer:

123 3/20

you need to get a common denominator which would be 20

5 10/20 + 8 8/20 + 8 5 / 20 =

21 23/20

21 + 1 3/20

22 3/20