16) 8 1/2 ·b = 0,2·6 2/3

16) $$8 \frac{1}{2} \cdotb = 0,2\cdot6 \frac{2}{3}$$

$$\frac{17}{2} \cdotb = \frac{1}{5}\cdot\frac{20}{3}$$

Пропорция: $$\frac{17}{2}:\frac{1}{5}=\frac{20}{3}:b$$

Ответ: $$\frac{17}{2}:\frac{1}{5}=\frac{20}{3}:b$$