12) 6 3 : 11 22

12) $$\frac{6}{11}: \frac{3}{22}$$

$$\frac{6}{11}: \frac{3}{22} = \frac{6}{11} \cdot \frac{22}{3} = \frac{6 \cdot 22}{11 \cdot 3} = \frac{6 \cdot 2}{3} = 2 \cdot 2 = 4$$

Ответ: 4