\(20-\sqrt{27}=\sqrt{400}-\sqrt{27}>0\Rightarrow\left|20-\sqrt{27}\right|=20-\sqrt{27}\)
\(\sqrt{27}-5=\sqrt{27}-\sqrt{25}>0\Rightarrow\left|\sqrt{27}-5\right|=\sqrt{27}-5\)
\(\left|20-\sqrt{27}\right|+\left|\sqrt{27}-5\right|+\sqrt{5}\)
\(=20-\sqrt{27}+\sqrt{27}-5+\sqrt{5}=15+\sqrt{5}\)