3) \(\frac{8}{15}\cdot24\)

Сократим 24 и 15 на 3: \(24:3=8\), \(15:3=5\).

\(\frac{8}{15}\cdot24=\frac{8\cdot8}{5}=\frac{64}{5}=12\frac{4}{5}\).

Ответ: \(12\frac{4}{5}\).