Fractions with radicals in the denominator I'm working my way through the videos on the Khan Academy, and have a hit a road block. I can't understand why the following is true:
$$\frac{6}{\quad\frac{6\sqrt{85}}{85}\quad} = \sqrt{85}$$

Are you sure you entered that right? It looks like you have $$(6) \over ({6 \sqrt{85}\over 85})$$ which would be equal to $$\sqrt{85}.$$
Note: this answer was written before the original question was edited. The original question was asking why (6)/(6√85/85) was equal to 6.
