Question 1157191
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Solve mentally (and quickly) with just a little bit of logical reasoning.<br>
Among the 95% who don't wear one piece of jewelry, half wear two and half wear none.  So among that 95%, the average number of pieces of jewelry worn is 1.<br>
But the other 5% wear one piece of jewelry -- so on average all 600 men wear one piece of jewelry.<br>
And that of course means the total number of pieces of jewelry is 600.<br>