The sum of 1/9, 2/3, and 5/18is

A. 8/30.

B. 12/9.

C. 19/18.

D. 4/15.

The least common multiple of 9, 3, and 18 is 18.

Convert 1/9 to 2/18.

Convert 2/3 to 12/18.

Then add the numerators:

2 + 12 + 5 = 19

So the answer is 19/18, or 1 1/18 if you prefer.

First I would add 1/9+2/3=7/9

next i would add 7/9+5/18 = 1 1/18