Решение:
a) $$\frac{6}{7}x = \frac{24}{49}$$
$$x = \frac{24}{49} : \frac{6}{7} = \frac{24}{49} \cdot \frac{7}{6} = \frac{24 \cdot 7}{49 \cdot 6} = \frac{4 \cdot 1}{7 \cdot 1} = \frac{4}{7}$$
б) $$x : \frac{3}{11} = \frac{22}{27}$$
$$x = \frac{22}{27} \cdot \frac{3}{11} = \frac{22 \cdot 3}{27 \cdot 11} = \frac{2 \cdot 1}{9 \cdot 1} = \frac{2}{9}$$
Ответы:
a) $$x = \frac{4}{7}$$
б) $$x = \frac{2}{9}$$