Drexel dragonThe Math ForumDonate to the Math Forum



Search All of the Math Forum:

Views expressed in these public forums are not endorsed by Drexel University or The Math Forum.


Math Forum » Discussions » Math Topics » geometry.puzzles.independent

Topic: coins problem
Replies: 7   Last Post: Jun 16, 2009 10:34 PM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ] Topics: [ Previous | Next ]
Brendan

Posts: 3
Registered: 12/4/04
Solution!!
Posted: Jan 27, 1999 7:15 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

Dear Helena,

I read your problem and have solved it straight away!
The key to the problem is being able to reduce the original number of
coins to 3...for obvious reasons.

I must warn you...I'm only fourteen so I may not be able to answer
what you really wanted.

However, I think one can determine the odd coin from 24 coins in four
weighings.

Weighing 1 = determine heavier 12coins
2 = determine heavier 6coins
3 = determine heavier 3 coins
4 = determine heaviest coin

One cannot determine the odd coin from 38 in 4 weighings. This is
because by the end of the third weighing one is left with four coins.
In a single weighing one cannot find one heavier coin.

I hope you find this useful.

Brendan





Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2014. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.