LEFT[ \BEGIN{matrix} \text{Mahendra }\!\!'\!\!\text{ s} \\ \text{PLACE} \\ \text{from left} \\ \end{matrix}+\begin{matrix} \text{Surendra }\!\!'\!\!\text{ s} \\ \text{place} \\ \text{from RIGHT} \\ \end{matrix} \right]+\left[ \begin{matrix} \text{Boys between} \\ \text{them} \\ \end{matrix} \right]\]\[=[17+18]+8=43\]