CAT Reasoning > Clocks PYQs

The numbers $1, 2,..., 9$ are arranged in a $3 \times 3$ square grid in such a way that each number occurs once and the entries along each column, each row, and each of the two diagonals add up to the same value. $$\newline$$ If the top left and the top right entries of the grid are $6$ and $2$, respectively, then the bottom middle entry is