б) 4. (y+2)+11y = 68;

Решим уравнение:

$$4(y + 2) + 11y = 68$$

$$4y + 8 + 11y = 68$$

$$15y + 8 = 68$$

$$15y = 68 - 8$$

$$15y = 60$$

$$y = 60 : 15$$

$$y = 4$$

Ответ: 4