Puzzle #23: Money Secrets
You and nine of your coworkers are sitting in a conference room when somebody wonders aloud about the group’s average salary. Everyone is curious, but nobody feels comfortable sharing their own pay with the group. How can you all learn your average salary without anybody learning any more information about another person’s salary (other than what can be deduced from the group average)?
You all have pen and paper and can conceal what you write from others, but you have no other tools at your disposal. You may assume that everybody cooperates with the chosen strategy.
Find the solution here.
