Greg Mankiw points us to this nice math puzzle from Terence Tao. My favorite answer is that of Harald Hance Olsen.
Down in the comments somebody pointed out than Steven Landsburg had asked the same question from an economic perspective (here). Check out the mathematician's reaction to Landsburg's article: It made me feel infinitely superior to the economists, as I could spot the problem with the benefit side of the equation the moment it was stated. (Insert your own economist joke here.).
He's right, the only thing we are left with is higher average pay :)
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I would say that economics puzzles and economists should study more hydraulics than mathematics, including financial engineer.
We should make it simpler:
Economics for Joe the Plumber
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