Apparently this logic puzzle has been going around the internet – this post is the first I’ve seen of it.
On my commute home, I worked it out. After reading it I HAD to find the solution. I ended up making a table on the back of a napkin to find my answer.
My friend said what he likes about this puzzle is that you have to work backwards – if you know what someone knows you have to know what they cannot know. That’s a nice twist.
I’ll put this in front of students one day and see where it takes us.