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+//clc()
+F = 100;//kg
+//F - feed, R - overflow, U - underflow, S - solvent
+//F + S = U + R ( Total balance )
+Poil1 = 49;//% ( 1 - feed )
+Ppulp1 = 40;//%
+Psalts1 = 3;//%
+Pwater = 100 - Poil1 - Ppulp1 - Psalts1;
+Phexane2 = 25;//%(2 - underflow)
+Psalts2 = 2.5;//%
+Poil2 = 15;//%
+Pwater2 = 7.5;//%
+Ppulp2 = 100 - Phexane2 -  Poil2 - Pwater2 - Psalts2;
+Poil3 = 25;//% ( 3 - extract )
+//taking pulp ( inert ) balance
+U = Ppulp1 * F / Ppulp2;
+//oil balance gives, F * Poil1 = U * Poil2 + R * Poil3,from these , we get
+R = (F * Poil1 - U * Poil2)/Poil3;
+S = U + R - F;
+disp("kg",S,"(a)The amount of solvent used for extraction = ")
+Precovered = 95;//%
+mhexane2 = Phexane2 * U / 100;
+mrecovered = mhexane2 * Precovered / 100;
+P = mrecovered * 100 / S ;
+disp("%",P,"(b)Percent of hexane used that is recovered from the underflow = ")
+Poil = Poil3 * R * 100 / (F * Poil1 );
+disp("%",Poil,"(c)Percent recovery of oil = ")