Situation: I am sitting and working at a desktop. There are a few more on my left but no more on my right.
Alternative situations: I am doing research on computer while sitting on a chair located in top right corner of the room and staring at the monitor in front of me. I am in a chair working on the rightmost monitor in front of me with four more monitors to my left.
Question: If you add all the chairs to my left and subtract the one I am sitting on, how many chairs there be?