5 out of 18 plus 2 out of 27 plus 10 out of 27?

5 out of 18 plus 2 out of 27 plus 10 out of 27?

Original 5 / 18 + 2 / 27 + 10 / 27
=5 / 18 + 12 / 27 (sum with the same denominator)
=5 / 18 + 4 / 9 (Simplified)
=5 / 18 + 8 / 18 (the least common multiple of 9 and 18)
=13/18