3. Решим уравнение:
$$ x : 9 = 6\frac{5}{36} $$ $$ x = 6\frac{5}{36} \cdot 9 $$ $$ x = \frac{6 \cdot 36 + 5}{36} \cdot 9 $$ $$ x = \frac{216 + 5}{36} \cdot 9 $$ $$ x = \frac{221}{36} \cdot 9 $$ $$ x = \frac{221}{4} $$ $$ x = 55 \frac{1}{4} $$Ответ: $$x = 55 \frac{1}{4}$$