Got this very nice puzzle from Vaibhav Kalia a while back, posting it on his behalf here.
The three of us made some bets. First, Walter won from Martin as much as Walter had originally. Next, Martin won from Steve as much as Martin then had left. Finally, Steve won from Walter as much as Steve then had left. We ended up having equal amounts of money. I started with 50 cents.
Who am I?
As a variation of the puzzle, also try the situation where after the three exchanges, you are back to where you started from – in that situation if I have 45 cents – who am I?
As always, please send your answers directly to me at firstname.lastname@example.org. If you like the puzzle, please share it with others. If you have interesting puzzles to share, please send them to me at my e-mail given above.