perplexus.info :: Weights and Scales : One of Sixteen

One of Sixteen (Posted on 2015-12-29)

I have two sets of 8 coins. In one set the coins weigh 30g each, in the other set the coins weigh 31g each.
Unfortunately they got mixed together in one big pile of 16 coins. I want to identify one coin. It can be from either set.

(Easy) Using a balance scale, identify a coin in four weighings.

(Hard) Identify a coin in just three weighings.

See The Solution Submitted by Brian Smith

Rating: 4.0000 (3 votes)

Comments: ( You must be logged in to post comments.)

Subject	Author	Date
re(4): Short solution.	broll	2016-01-12 22:14:47
re(3): Short solution.	Jer	2016-01-12 10:20:32
re(2): Short solution.	broll	2016-01-11 23:08:08
re: Short solution.	Jer	2016-01-11 12:30:33
re(2): What's the problem? (and a spoiler)	Steve Herman	2016-01-01 10:34:53
re: What's the problem? (and a spoiler)	Brian Smith	2015-12-31 13:06:07
What's the problem? (and a spoiler)	Steve Herman	2015-12-31 12:16:44
re: Short solution.	Ady TZIDON	2015-12-31 10:49:14
Short solution.	broll	2015-12-30 22:09:31
re: Solution (hard)	Ady TZIDON	2015-12-30 17:01:14
Solution (hard)	Paul	2015-12-30 12:08:39
Easy does it	Steve Herman	2015-12-29 13:45:30

Please log in:

Login:
Password:
Remember me:

Sign up! \| Forgot password

Search:

Search body:

Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (3)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:


perplexus dot info