! Bronson, Pr. 1.17
MIN 2 x1 +3 x2 + 5 x3 +6 x4 +8 x5 +8 x6
SUBJECT TO
1) 20 x1 + 30 x2 + 40 x3 + 40 x4 + 45 x5 + 30 x6 >= 70
2) 50 x1 + 30 x2 + 20 x3 + 25 x4 + 50 x5 + 20 x6 >= 100
3) 4  x1 +  9 x2 + 11 x3 + 10 x4 +  9 x5 + 10 x6 >= 20
END