For students studying Decision Mathematics try Linear Programming from Transum. This provides you with a reminder of inequalities and gives you 5 problems to try.
If you need some notes and further activities on Linear Programming then try these from CIMT which provide an excellent introduction as well as exercises with answers.
This earier post post looks at the use of Technology to interpret solutions to such problems and includes online utilities and instructions on the use of the Excel Solver. Examination questions are used to illustrate the use of these tools.