13) 2 1/20 : 1 12/13

\(2\frac{1}{20}:1\frac{12}{13}=\frac{41}{20}:\frac{25}{13}=\frac{41}{20}\cdot\frac{13}{25}=\frac{533}{500}=1\frac{33}{500}\).

Ответ: \(1\frac{33}{500}\).