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ConradCHESS .. keyboard .. logic .. IM Conrad Goodman

Of 36 students, 5 play no instrument. If 18 play guitar and 6 of these
guitarists also play keyboard, how many students only play the keyboard?

Congratulations to these solvers as of
Niven Brown, Dinesh de Silva, Egon Feller, Albert Frank, Joshua Green,
Lance Co, LW Luk, Roger Mayer, Glenn McCorkle, Don Reithel, Matthew Robinson,
Nash Singh, Bernard Sojka, Steve Steppe, Hennie van Jaarsveld, Brett Verhagen,
Luc Vingerhoets, Jay Willner and Brend Wesseling.

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