1) $$\frac{22}{31}:\frac{11}{12} = \frac{22}{31} \cdot \frac{12}{11} = \frac{2 \cdot 11 \cdot 12}{31 \cdot 11} = \frac{2 \cdot 12}{31} = \frac{24}{31}$$
2) $$\frac{24}{31} = \frac{x}{155}$$
3) $$x = \frac{24 \cdot 155}{31} = 24 \cdot 5 = 120$$
Ответ: 120