NEW CHALLENGE

Congratulations to Cadet Samantha Migliori who correctly determined that the answer is 19. 

Here's a new challenge for the logically or mathematically inclined among you:

At a classic car auction, thirty buyers were present. Ten of the buyers bought fewer than 6 cars. Eight of the buyers bought more than 7 cars. Five buyers bought more than 8 cars. One buyer bought more than 9 cars. What is the total number of buyers who bought 6, 7, 8, or 9 cars?

  This challenge will close at 0730 20 November 2012.  The winner will receive, along with the respect of their classmates, a tasty box of Milk Duds. 

A classic car auction