First, alas I won’t be able to make it to the Amazing Meeting this year because of a clash of dates. Sorry about that. It’s a wonderful convention, and if you are into science and skepticism it’s a great place to be.
OK, here is the Friday puzzle! Solution on Monday.
John and Joan decide to play several games of cards, with a stake of £1 per game. After several games John has won three games and Joan has won £3. How many games did the two of them play?
I have produced an ebook containing 101 of the previous Friday Puzzles! It is called PUZZLED and is available for the Kindle (UK here and USA here) and on the iBookstore (UK here in the USA here). You can try 101 of the puzzles for free here.