$$2\frac{3}{4} + 2\frac{1}{5} = 2 + 2 + \frac{3}{4} + \frac{1}{5} = 4 + \frac{15+4}{20} = 4 + \frac{19}{20} = 4\frac{19}{20}$$
$$4\frac{19}{20} \cdot 16 = \frac{4\cdot 20 + 19}{20} \cdot 16 = \frac{99}{20} \cdot 16 = \frac{99}{5} \cdot 4 = \frac{396}{5} = 79.2$$
Ответ: 79.2