18 27 20 40

\[ \frac{18}{20} \div \frac{27}{40} = \frac{18}{20} \cdot \frac{40}{27} = \frac{18 \cdot 40}{20 \cdot 27} = \frac{720}{540} = \frac{4}{3} = 1\frac{1}{3} \]

Ответ: \(1\frac{1}{3}\)