Jump to content


Welcome to BrainDen.com - Brain Teasers Forum

Welcome to BrainDen.com - Brain Teasers Forum. Like most online communities you must register to post in our community, but don't worry this is a simple free process. To be a part of BrainDen Forums you may create a new account or sign in if you already have an account.
As a member you could start new topics, reply to others, subscribe to topics/forums to get automatic updates, get your own profile and make new friends.

Of course, you can also enjoy our collection of amazing optical illusions and cool math games.

If you like our site, you may support us by simply clicking Google "+1" or Facebook "Like" buttons at the top.
If you have a website, we would appreciate a little link to BrainDen.

Thanks and enjoy the Den :-)
Guest Message by DevFuse
 

Photo
- - - - -

12 Coins


  • Please log in to reply
1 reply to this topic

#1 thepaulthomas

thepaulthomas

    Newbie

  • Members
  • Pip
  • 1 posts

Posted 09 August 2007 - 12:56 AM

Sorry if this has already been posted, I think it's a pretty well known one:

You are given twelve coins. They are completely identical in every respect, except that one of the coins is EITHER heavier OR lighter than all of the others, and you have no idea which. You also have a set of balancing scales. With only three uses of the scales (i.e. weighing some of the coins against some of the others and finding out which set is heavier than the other), how can you determine which coin is the odd one out and whether it is heavier or lighter?

I promise you, it can be done!
  • 0

#2 Martini

Martini

    Senior Member

  • Members
  • PipPipPipPip
  • 770 posts

Posted 09 August 2007 - 01:37 AM

Good puzzle, thepaulthomas, and welcome to the boards! But it has already been posted using pool balls in Weighing IV.

this topic is locked
  • 0




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users