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\frac{\sqrt{5}}{2\sqrt{5}+\sqrt{5}}
Factor 20=2^{2}\times 5. Rewrite the square root of the product \sqrt{2^{2}\times 5} as the product of square roots \sqrt{2^{2}}\sqrt{5}. Take the square root of 2^{2}.
\frac{\sqrt{5}}{3\sqrt{5}}
Combine 2\sqrt{5} and \sqrt{5} to get 3\sqrt{5}.
\frac{\sqrt{5}\sqrt{5}}{3\left(\sqrt{5}\right)^{2}}
Rationalize the denominator of \frac{\sqrt{5}}{3\sqrt{5}} by multiplying numerator and denominator by \sqrt{5}.
\frac{\sqrt{5}\sqrt{5}}{3\times 5}
The square of \sqrt{5} is 5.
\frac{5}{3\times 5}
Multiply \sqrt{5} and \sqrt{5} to get 5.
\frac{5}{15}
Multiply 3 and 5 to get 15.
\frac{1}{3}
Reduce the fraction \frac{5}{15} to lowest terms by extracting and canceling out 5.