500 bytes added,
16:28, 13 August 2010 Here is a puzzle I saw on someones problem of the week site. They had it phrased using batteries. Here is another version.
==Puzzle==
You come across eight stones. You know that 4 of the stones weigh the same, while the other four all weigh different amounts. How many times might you have to use a balance scale before you can know for sure that the next two stones you will weigh will be equal?
==See also==
*[[Six weights]]
*[[Nine weights]]
*[[Twelve weights]]
[[Category: Optimization]]