Pls answer this questions

Dear Student ,
11.

$$\begin{gathered} According to your question : \\ \frac{Female Teachers\left(F\right)}{Male teachers\left(M\right)}=x \\ and \\ \frac{M}{F}=y \\ So , \\ x+y=\frac{F}{M}+\frac{M}{F} \\ =\boxed{\frac{{\mathbf{F}}^{\mathbf{2}}\mathbf{+}{\mathbf{M}}^{\mathbf{2}}}{\mathbf{M}\mathbf{F}}} \end{gathered}$$
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