Ответ:

[tex]a) \frac{x}{1.2} = \frac{5}{0.3} \\ 0.3x = 6 \\ x = 20 \\ b) \frac{6}{2.4} = \frac{y - 1}{2.8} \\ 16.8 = 2.4(y - 1) \\ y - 1 = 7 \\ y = 8[/tex]