Answer:
13.3
Step-by-step explanation:
[tex]for \: the \: boys \: = 6 \times \frac{3}{5} = \frac{18}{5} \\ for \: the \: girls \: = 5 \times \frac{3}{10} = \frac{15}{10} = \\ and \: for \: the \: teacher \: = \frac{1}{2} \\ by \: add \: all \: of \: the \: above \: \\ \frac{18}{5} + \frac{15}{10} + \frac{1}{2} = \frac{67}{5} = 13.4[/tex]
