Situation: I am sitting in the seat on the left in the last row and right behind me towards 7 o'clock is a backpack.
Alternative situations: I am sitting on the rightmost chair on the second row of the left column and I can see a desk on my 12 o'clock direction. My back pack was placed on a chair while I was given a lesson in a room.
Question: How many seats are directly in front of me?