Решение:
\[ 1\frac{2}{9} : 3\frac{2}{3} = \frac{11}{9} : \frac{11}{3} = \frac{11}{9} \times \frac{3}{11} = \frac{3}{9} = \frac{1}{3} \]
\[ 2\frac{1}{6} - \frac{1}{3} = \frac{13}{6} - \frac{1}{3} = \frac{13}{6} - \frac{2}{6} = \frac{11}{6} = 1\frac{5}{6} \]
Ответ: \[ 1\frac{5}{6} \]