\[\left( \frac{5}{18} - \left( - \frac{11}{27} \right) \right)\ :\left( - 2\frac{5}{16} \right) =\]
\[= \left( \frac{15}{54} + \frac{22}{54} \right)\ :\left( - \frac{37}{16} \right) =\]
\[= - \frac{37 \cdot 16}{54 \cdot 37} = - \frac{8}{27}\]