1) Найдем число c:
$$c : 7 = 5 \frac{5}{6}$$
$$c = 5 \frac{5}{6} \cdot 7$$
$$c = \frac{35}{6} \cdot 7 = \frac{245}{6} = 40 \frac{5}{6}$$
Ответ: $$40 \frac{5}{6}$$