3) 5 1/8 : 9/32

\(5\frac{1}{8}=\frac{41}{8}\).

\(\frac{41}{8}:\frac{9}{32}=\frac{41}{8}\cdot\frac{32}{9}=\frac{164}{9}=18\frac{2}{9}\).

Ответ: 18 2/9.