Ответ: 58
\[1\frac{3}{8} = \frac{1 \cdot 8 + 3}{8} = \frac{11}{8}\]
\[2\frac{1}{4} = \frac{2 \cdot 4 + 1}{4} = \frac{9}{4}\]
\[\frac{11}{8} + \frac{9}{4} = \frac{11}{8} + \frac{9 \cdot 2}{4 \cdot 2} = \frac{11}{8} + \frac{18}{8} = \frac{11+18}{8} = \frac{29}{8}\]
\[\frac{29}{8} \cdot 16 = \frac{29 \cdot 16}{8} = \frac{29 \cdot 2}{1} = 58\]
Ответ: 58