A furniture company produces tables and chairs. The profit on each table is $15 and $5 for each chair. The amount of wood available is enough for at most 25 tables and chairs. They need to produce at least 5 tables but no more than 15 tables. They also need to produce at least 10 chairs but no more than 20 chairs. The company needs to know many of each should be prepared to maximize the profit. How could the variables be defined? *