Clue to Riddle #65: 9 Coins, 1 Odd one, 2 Weighings

65. There are 9 coins, all except one are the same weight, the odd one is heavier than the rest. You must determine which is the odd one out using an old fashioned balance. You may use the balance twice. Explain how this can be done.
old fashioned scale It's always difficult to give clues to the quickie puzzles. But I would say this. Because we know, as fact, that one coin must be heavy it would be sufficient to eliminate coins 1 - 8 in order to prove that it is number nine....

That having been said, a good initial weighing would be 1,2 & 3 against 4,5 & 6.

Where next?
Questions Answer





© Nigel Coldwell 2004 -  – The questions on this site may be reproduced without further permission, I do not claim copyright over them. The answers are mine and may not be reproduced without my expressed prior consent. Please enquire using the link at the top of the page.
 


PayPal
I always think it's arrogant to add a donate button, but it has been requested. If I help you get a job though, you could buy me a pint! - nigel

This Website Uses Cookies

Mostly, but not entirely to remember if you have dismissed this very box. Also to increase the functionality of the site. The cookies I apply do not uniquely identify you, by continuing to use this site you agree to let me place a cookie. I also have advert and analytics providers, for more information click here here.x