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\frac{5\sqrt{15}\sqrt{15}}{\left(\sqrt{15}\right)^{2}}
Rationalize the denominator of \frac{5\sqrt{15}}{\sqrt{15}} by multiplying numerator and denominator by \sqrt{15}.
\frac{5\sqrt{15}\sqrt{15}}{15}
The square of \sqrt{15} is 15.
\frac{5\times 15}{15}
Multiply \sqrt{15} and \sqrt{15} to get 15.
\frac{75}{15}
Multiply 5 and 15 to get 75.
5
Divide 75 by 15 to get 5.
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