64 16 = 76 19

$$\frac{64}{76} : \frac{16}{19} = \frac{64}{76} \cdot \frac{19}{16} = \frac{64 \cdot 19}{76 \cdot 16} = \frac{4 \cdot 16 \cdot 19}{4 \cdot 19 \cdot 16} = 1$$

Ответ: 1