и) $$5\frac{5}{6} : \frac{7}{18} = \frac{5 \cdot 6 + 5}{6} : \frac{7}{18} = \frac{35}{6} : \frac{7}{18} = \frac{35}{6} \cdot \frac{18}{7} = \frac{35 \cdot 18}{6 \cdot 7} = \frac{5 \cdot 7 \cdot 3 \cdot 6}{6 \cdot 7} = 5 \cdot 3 = 15$$
Ответ: 15