Mass transfer Operation

Q$3.$ A mixture of $35$mole$\%$A and $65$ moles $\%B$ is to be separated in a distillationcolumn. The concentration of A in the distillate is $93$ moles $\%$ and $96$ moles$\%$ of all A is in distillate. The feed is half vapour and reflux ratio are $4$:$1.$ The relative volatility $({}_{AB})$ is $2\mathrm{.}5.$ Find the equilibrium stages that are required ineach section of the column? What could be the minimum reflux ratio for thisoperation?