3. Решите уравнение: $$y : 7 = 5\frac{9}{28}$$.

$$y : 7 = 5\frac{9}{28}$$

$$y = 5\frac{9}{28} \cdot 7$$

$$y = \frac{149}{28} \cdot 7$$

$$y = \frac{149 \cdot 7}{28}$$

$$y = \frac{149}{4}$$

$$y = 37\frac{1}{4}$$

Ответ: $$37\frac{1}{4}$$