$($b$)$ A foed mixture of A and molesi A and $55$ mole $\%B$ is to be separated into a top product containing $96$ mole$\%$ A and a bottom product having $95$ notrow$-59$ mohe$\%$ B$.$ The feod is $50\%$ vapour and the rellux ratio is $1\mathrm{.}5$ times the minimuth. What is the equation of the feed line? Determine the number of ideal trays required and the location of the feed tray$-$Given: $a_{AB}=2\mathrm{.}8.(10)$

$y=-(\frac{2}{-})x+\frac{x}{k-4}$