The technical crew of the play needs shirts. Each shirt color matches the job the crew will be
working on. Different color shirts have different designs and therefore cost different amounts.
You will need:

 6 red shirts, at $10.90 each for the lighting crew
 4 yellow shirts at $ $10.50 each for the props crew
 5 purple shirts at $12.50 each for the make-up crew

You have $200.00 to spend on all the shirts. How many green shirts can you purchase for the ushers if
those shirts cost $11.50 each? If you spend less than your budget, how much money do you have left
over?