Answer
30
Work Step by Step
We first combine this into one square root:
$5 \times 1/6 \sqrt {6\times 216} = 5/6 \sqrt {1296}$
In order to see if a radical is in simplified form, see if any of its factors are perfect squares (meaning that their square root will be an integer). We see that 1296 is a perfect square, so we know that we can simplify:
$5/6 \sqrt {1296}=⅚ \times 36=30$
