Blog posts with problems to get your brain going! You get a new problem every fortnight and the solutions are published later.
If you want the problems delivered to your inbox be sure to subscribe to the Problems newsletter.
The next problem is scheduled for Sunday, 2nd of May.
You may notice some problems are missing... I'm still migrating articles from my old blog.
A bunch of ants are left inside a very, very, tight tube, and they keep colliding with each other and turning around. How long will it take them to escape?
In this post I talked about the riddle of the water buckets. Now I challenge you to prove that in some situations it is impossible to solve it!
Gandalf has some Hobbits to appease but his task seems to go on forever. Can you give him a hand..?
Two friends were bored and decided to play a game... a mathematical game with a paper bag!