Tomato puree $($at $15C,Cp=3\mathrm{.}9k\frac{J}{k}gK)$ containing $25\%$ solids enters an evaporator at

the rate of $35k\frac{g}{m}in.$ Saturated steam $(75\%$ quality$)$ at $169\mathrm{.}06$kPa pressure enters the

evaporator at the rate of $17k\frac{g}{m}in$ and leaves as condensate at $115C.$ The specific heat

of the product is $3\mathrm{.}7k\frac{J}{k}gK.$ If the evaporator is operating at $65C,$ determine:

a$.$ The solids content of the concentrated product

b$.$ The surface area of heat exchanger required $($the overall heat transfer coefficient is

$\{$:$2500\frac{W}{m^2}(K)).$