Find the Average of the Set of Numbers $6 \frac{2}{3}$ And $18 \frac{5}{6}$

Multiple Choice

Find the average of the set of numbers.
- $6 \frac{2}{3}$ and $18 \frac{5}{6}$

A) $25 \frac{1}{2}$
B) $12 \frac{3}{4}$
C) $22 \frac{1}{6}$
D) $11 \frac{1}{12}$