14. $$3 \cdot \frac{9}{16} + 4 \cdot \frac{11}{16} =$$

$$3 \cdot \frac{9}{16} + 4 \cdot \frac{11}{16} = \frac{3 \cdot 9}{16} + \frac{4 \cdot 11}{16} = \frac{27}{16} + \frac{44}{16} = \frac{27+44}{16} = \frac{71}{16} = 4 \frac{7}{16}$$ Ответ: $$\frac{71}{16} = 4 \frac{7}{16}$$