49.15.3.2 16 8 5

49. $$ \frac{15}{16} : \frac{3}{8} : \frac{2}{5} = \frac{15}{16} \cdot \frac{8}{3} \cdot \frac{5}{2} = \frac{15 \cdot 8 \cdot 5}{16 \cdot 3 \cdot 2} = \frac{5 \cdot 1 \cdot 5}{2 \cdot 1 \cdot 2} = \frac{25}{4} = 6\frac{1}{4}$$

Ответ: $$6\frac{1}{4}$$