Several ores are blended to a final product that must have a certain quality ('grade'). We wish to determine the quantity of every ore to be used in the blend with the objective to maximize the total profit (calculated as sales revenues - raw material cost).

• simple LP problem
• data in model or input from file
• bounds on variables

Further explanation of this example: 'Mosel User Guide', Section 2.2 'A blending example'; 'Applications of optimization with Xpress-MP', Section 2.7 'Blending constraints'. Similar problems: Section 6.1 'Production of alloys' (a1alloy.mos), Section 6.2 'Animal food production' (a2food.mos), Section 6.3 'Refinery' (a3refine.mos)

! Data file for 'blend.mos'
COST: [85 93]
AVAIL: [60 45]
GRADE: [2.1 6.3]