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Take the right one (Posted on 2013-10-18) Difficulty: 3 of 5
Among 100 coins exactly 4 are fake. All genuine coins weigh the same; all fake coins, too. A fake coin is lighter than a genuine coin.

How would we find at least one genuine coin using two weighings on a balance scale?

Source: 2010 Euler math Olympiad in Russia- authored by A.Shapovalov

No Solution Yet Submitted by Ady TZIDON    
Rating: 3.0000 (1 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
re: question for Tristan | Comment 12 of 18 |
(In reply to question for Tristan by xdog)

You're right, I made a miscalculation.  It doesn't seem like there's a quick fix.
  Posted by Tristan on 2013-10-20 00:37:09

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