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\frac{40\sqrt{5}}{20\left(\sqrt{5}\right)^{2}}
Rationalize the denominator of \frac{40}{20\sqrt{5}} by multiplying numerator and denominator by \sqrt{5}.
\frac{40\sqrt{5}}{20\times 5}
The square of \sqrt{5} is 5.
\frac{2\sqrt{5}}{5}
Cancel out 20 in both numerator and denominator.