\ File: lo1.lp maximize obj: 3 x1 + x2 + 5 x3 + x4 subject to c1: 3 x1 + x2 + 2 x3 = 30 c2: 2 x1 + x2 + 3 x3 + x4 >= 15 c3: 2 x2 + 3 x4 <= 25 bounds 0 <= x1 <= +infinity 0 <= x2 <= 10 0 <= x3 <= +infinity 0 <= x4 <= +infinity end