perplexus.info :: Weights and Scales : Take the right one

Take the right one (Posted on 2013-10-18)

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
re: Query .....answered	Ady TZIDON	2013-10-26 05:06:23
re: Think I've got it	Salil	2013-10-22 00:52:18
Finding 13 Genuine Coins	Brian Smith	2013-10-20 19:12:35
Think I've got it	xdog	2013-10-20 13:24:15
Query	Kenny M	2013-10-20 10:23:43
h i n t ,,,,,,partial division	Ady TZIDON	2013-10-20 07:36:28
re: question for Tristan	Tristan	2013-10-20 00:37:09
question for Tristan	xdog	2013-10-19 21:35:46
99 coins	Tristan	2013-10-19 13:26:21
Solution	Tristan	2013-10-19 13:20:04
reply to Tristan	xdog	2013-10-19 10:42:40
re(3): question for Kenny	Kenny M	2013-10-19 09:27:19
re: Solution	Tristan	2013-10-19 03:38:57
re(2): question for Kenny	Charlie	2013-10-19 01:38:08
re: question for Kenny	Kenny M	2013-10-19 00:32:09
Solution	xdog	2013-10-18 23:21:40
question for Kenny	xdog	2013-10-18 21:27:49
Solution (spoiler)	Kenny M	2013-10-18 20:35:05

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