3. Решите уравнение: $$y : 7 = 5\frac{9}{28}$$
$$y : 7 = \frac{5 \cdot 28 + 9}{28}$$
$$y : 7 = \frac{140 + 9}{28}$$
$$y : 7 = \frac{149}{28}$$
$$y = \frac{149}{28} \cdot 7$$
$$y = \frac{149 \cdot 7}{28}$$
$$y = \frac{149 \cdot 7}{7 \cdot 4}$$
$$y = \frac{149}{4} = 37 \frac{1}{4} = 37,25$$
Ответ: 37,25