Situation: I am in front of the whiteboard getting ready for a meeting in 15 minutes, and right behind me is a table with a chair in the corner of the table.
Alternative situations: Drawing in the middle of the whiteboard. After reading the presetation plan on a table behind me, I am writing a title on a whiteboard in front of me, planning to use a chair on my left to climb higher.
Question: Can the number of chairs behind me be divided by three?