I have many people coming to my house this year for Thanksgiving.  Can you help me figure out how to arrange my tables?

• I have 6 rectangular tables
• Each table can seat 3 people on a side and one person on each end
• I would like to push the 6 tables together to make one large rectangular table

4th and 5th graders:  There are 4 different ways that I can arrange the 6 tables when I push them together.
                                How many people can sit at the 'large' table each way?