Решим задачу по действиям:
$$6 \frac{2}{7} \cdot 3 = \frac{44}{7} \cdot 3 = \frac{44 \cdot 3}{7} = \frac{132}{7} = 18 \frac{6}{7}$$.
$$18 \frac{6}{7} - 2 \frac{6}{7} = (18 - 2) + (\frac{6}{7} - \frac{6}{7}) = 16 + 0 = 16$$.
$$6 \frac{2}{7} + 18 \frac{6}{7} + 16 = (6 + 18 + 16) + (\frac{2}{7} + \frac{6}{7}) = 40 + \frac{8}{7} = 40 + 1 \frac{1}{7} = 41 \frac{1}{7}$$.
Ответ: 41 1/7