/* example2-2.mod.txt */

var x11 >= 0 ;
var x12>= 0 ;
var x13>= 0 ;
var x21 >= 0 ;
var x22>= 0 ;
var x23>= 0 ;

minimize z: 10*x11 + 6*x12 + 16*x13 + 8*x21 + 8*x22 + 10*x23;
s.t. S1: x11 + x12 + x13 = 80;
s.t. S2: x21 + x22 + x23 = 160;
s.t. D1: x11 + x21 = 120;
s.t. D2: x12 + x22 = 40;
s.t. D3: x13 + x23 = 80;

end;