I will be taking a break from puzzles for the next two weekends after this post!
My fascination with A Moscow Math Circle (Week by week Problem Sets) by Sergey Dorichenko continues. Here is another one from there.
Each of three identical jars is 2/3 full of paint of different colors. Any part of the paint in one jar can be poured into another jar, and the paints mix homogeneously when this happens. How can the same mixture be obtained in all three jars if paint cannot be poured either out or into any other container?
As always, please send your answers as comments within the blog (preferred), or send an e-mail to firstname.lastname@example.org. Please do share the puzzle with others if you like, and please also send puzzles that you have come across that you think I can share in this blog.