A group of privates were standing in the blistering sun facing due west. Their sergeant shouted at them: Right turn! About turn! Left turn! In which direction are they now facing?
Answer
East. A right turn is 90 degrees, an about turn is 180 degrees, and a left turn is also 90 degrees. The right turn and left turn cancel each other out, so they effectively made an 180 degrees about turn. Therefore, the privates are now facing East.