Before starting to solve the problem, it should be balanced. If not then make it balanced by ..... ...... column incase demand is less than supply or by adding ............ raw incase supply is less than the demand

Operations research, often shortened to the initialism OR, is a discipline that deals with the development and application of analytical methods to improve decision-making. The term management science is occasionally used as a synonym. (Source: Wikipedia)

Examples of operation research models are: a map, activity charts balance sheets, PERT network, break-even equation, economic ordering quantity equation etc.