For a National Junior Honor Society Induction Celebration, Ahmed is renting tables and chairs. He wants to have only tables for 4 and tables for 2. The total number of people that can be seated in the school cafeteria with these tables is 80. Describe some possible combinations (at least 2) of 4-seat tables and 2-seat tables that will seat 80 customers. Explain how you found them (you can show the equations; using numbers instead of words).