15 square root of 90 divided by Square root of 125

To simplify the expression:

√90 / √125

First, simplify the square roots separately:

√90 = √(9 * 10) = √9 * √10 = 3 * √10
√125 = √(5 * 5 * 5) = √5 * √5 * √5 = 5 * 5 * √5 = 25√5

Now, substitute the simplified values back into the expression:

(3 * √10) / (25√5)

Since the square root terms are different, we cannot cancel them out. Thus, we leave them as they are:

(3 * √10) / (25√5)

This is the simplified expression.