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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: ( You must be logged in to post comments.)
  Subject Author Date
Hints/Tipsre: Query .....answeredAdy TZIDON2013-10-26 05:06:23
re: Think I've got itSalil2013-10-22 00:52:18
SolutionFinding 13 Genuine CoinsBrian Smith2013-10-20 19:12:35
Think I've got itxdog2013-10-20 13:24:15
QueryKenny M2013-10-20 10:23:43
Hints/Tipsh i n t ,,,,,,partial divisionAdy TZIDON2013-10-20 07:36:28
re: question for TristanTristan2013-10-20 00:37:09
question for Tristanxdog2013-10-19 21:35:46
Hints/Tips99 coinsTristan2013-10-19 13:26:21
SolutionSolutionTristan2013-10-19 13:20:04
reply to Tristanxdog2013-10-19 10:42:40
re(3): question for KennyKenny M2013-10-19 09:27:19
re: SolutionTristan2013-10-19 03:38:57
re(2): question for KennyCharlie2013-10-19 01:38:08
re: question for KennyKenny M2013-10-19 00:32:09
Solutionxdog2013-10-18 23:21:40
question for Kennyxdog2013-10-18 21:27:49
Solution (spoiler)Kenny M2013-10-18 20:35:05
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