24) (1/6 + 1/4) * 9

24) \((\frac{1}{6} + \frac{1}{4}) \cdot 9 = (\frac{2}{12} + \frac{3}{12}) \cdot 9 = \frac{5}{12} \cdot 9 = \frac{5 \cdot 9}{12} = \frac{5 \cdot 3}{4} = \frac{15}{4} = 3\frac{3}{4}\)
Ответ: 15/4