[tex]5 \frac{1}{2} + 7 \frac{3}{5} + 3 \frac{1}{4} \\ \frac{11}{2} + \frac{38}{5} + \frac{13}{4} \\ \frac{11 \times 10}{2 \times 10} + \frac{38 \times 4}{5 \times 4} + \frac{13 \times 5}{4 \times 5} \\ \frac{110 + 162 + 65}{20} \\ = \frac{337}{20} = 16.85[/tex]
