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Yet another brainteaser

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I just remembered this one.

A tennis club with 200 members organises a tournament.  If a player loses a match they are out of the tournament, and there are no draws.  How many matches are needed to decide the tournament winner?

Permalink 3 comments (latest comment by Ian Megaw, Friday, 25 Feb 2011, 14:13)
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Richard Walker

Another brainteaser

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Edited by Richard Walker, Saturday, 27 Feb 2010, 01:17

In a cross-country run, Sven placed exactly in the middle among all participants.

Dan placed lower (i.e. did worse than Sven), in tenth place, and Lars placed sixteenth.

How many runners took part in the race?

(This is another mini-classic, I'll try to recollect where it was first published.)

Permalink 4 comments (latest comment by Dean Van Rooyen, Sunday, 30 Jan 2011, 21:24)
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