All about flooble | fun stuff | Get a free chatterbox | Free JavaScript | Avatars    
perplexus dot info

Home > Logic > Weights and Scales
One out of Five (Posted on 2016-01-04) Difficulty: 2 of 5
A set of five coins contains two that weigh 31g, two that weigh 33g, and one that weighs 32g. Using a balance scale just two times positively identify the weight of at least one coin.

See The Solution Submitted by Brian Smith    
Rating: 3.0000 (1 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
Solution Solution | Comment 1 of 2
Weigh two coins on each side

Case 1: The sides balance.  They both have a 31g and a 33g coin
The unused coin must be 32g.

Case 2: One side is heavier.  It has at least one 33g coin.
Test the two coins from the heavier side against each other.
The heavier one is 33g, if they balance they are both 33g.



  Posted by Jer on 2016-01-04 10:10:44
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 (2)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:
Copyright © 2002 - 2017 by Animus Pactum Consulting. All rights reserved. Privacy Information