Model hs72 Parameters a[1][1] = 4 a[1][2] = 2.25 a[1][3] = 1 a[1][4] = 0.25 a[2][1] = 0.16 a[2][2] = 0.36 a[2][3] = 0.64 a[2][4] = 0.64 b[1] = 0.0401 b[2] = 0.010085 End Parameters Variables x[1:4] = 1, >= 0.001 End Variables Equations a[1][1]/x[1] + a[1][2]/x[2] + a[1][3]/x[3] + a[1][4]/x[4] <= b[1] a[2][1]/x[1] + a[2][2]/x[2] + a[2][3]/x[3] + a[2][4]/x[4] <= b[2] x[1] <= 4e5 x[2] <= 3e5 x[3] <= 2e5 x[4] <= 1e5 ! best known objective = 727.67937 minimize 1 + x[1] + x[2] + x[3] + x[4] End Equations End Model