27. \(\frac{1}{\frac{1}{36}+\frac{1}{44}}\)

\(\frac{1}{36}+\frac{1}{44}=\frac{11}{396}+\frac{9}{396}=\frac{20}{396}=\frac{5}{99}\).

\(1:\frac{5}{99}=\frac{99}{5}=19\frac{4}{5}\).

Ответ: \(19\frac{4}{5}\).