з) $$3\frac{11}{24} + \frac{1}{6} = 3\frac{11}{24} + \frac{1\cdot4}{6\cdot4} = 3\frac{11}{24} + \frac{4}{24} = 3 + (\frac{11}{24} + \frac{4}{24}) = 3 + \frac{15}{24} = 3 + \frac{5}{8} = 3\frac{5}{8}$$
Ответ: $$3\frac{5}{8}$$