SSC JE Civil Engineering 2018 Set 5 Solved Paper

If the length of a combined footing for two columns l meters apart is L and the projection on the left side of the exterior column is x, then the projection y on the right side of the exterior column, in order to have a uniformly distributed load is (Where x' is the distance of center of gravity of column loads)
A. $\mathit{y}=\mathit{L}-\left(\mathrm{l}-\mathit{x}\prime \right)$
B. $\mathit{y}=\frac{\mathit{L}}{2}+\left(\mathrm{l}-\mathit{x}\prime \right)$
C. $\mathit{y}=\frac{\mathit{L}}{2}-\left(\mathrm{l}+\mathit{x}\prime \right)$
D. $\mathit{y}=\frac{\mathit{L}}{2}-\left(\mathrm{l}-\mathit{x}\prime \right)$