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