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diff --git a/632/CH9/EX9.4/example9_4.sce b/632/CH9/EX9.4/example9_4.sce
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+//clc()
+D = 100;//kg of overhead product
+xfa = 0.956;
+xdw = 0.074;
+xdb = 0.741;
+xda = 0.185;
+//water balance gives
+F = D * xdw / (1 - xfa) ;
+W = F * xfa - xda * D;
+W1 = 100;
+B = xdb*D;
+Bused = B * W1 / W;
+disp("kg",Bused,"Quantity of benzene required = ")