16) 3 \(\frac{4}{7} + \frac{8}{11}\)

16) \( 3 \frac{4}{7} + \frac{8}{11} = 3 \frac{4 \cdot 11}{7 \cdot 11} + \frac{8 \cdot 7}{11 \cdot 7} = 3 \frac{44}{77} + \frac{56}{77} = 3 + \frac{44+56}{77} = 3 \frac{100}{77} = 3 + 1 \frac{23}{77} = 4 \frac{23}{77} \)