\[\frac{6 + \sqrt{6}}{\sqrt{30} + \sqrt{5}} = \frac{\sqrt{6}\left( \sqrt{6} + 1 \right)}{\sqrt{5}\left( \sqrt{6} + 1 \right)} =\]
\[= \frac{\sqrt{6}}{\sqrt{5}} = \frac{\sqrt{30}}{5}.\]