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12 Coins


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Reply to topic    Forum Pakistan - Pakistani Forums Home » Pahele (Quiz)
12 Coins
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askari.z55
Senior Proud Pakistani
Senior Proud Pakistani


Joined: 15 Nov 2007
Posts: 1729
Location: UAE

12 Coins
You are handed 12 metal coins which look alike. However, one of them is fake and weighs either more or less than each of the other 11 coins (which all have identical weight). To measure or compare weights you have only a pan balance that tips down to the side with the greater weight or stays in balance if both pans hold equal weights.

With how many weightings can you find the fake coin and also determine if its weight is more or less than the weight of the other coins? How do you do it?

_________________
"O son of Adam if you have collected anything in excess of your actual need you will act only as its trustee for someone else to use it.""(Imam Ali(a.s))"
Sat Dec 22, 2007 11:17 pm View user's profile Send private message Visit poster's website Yahoo Messenger MSN Messenger
shakeelmscw
Shayari Moderator
Shayari Moderator


Joined: 22 Aug 2007
Posts: 5392
Location: United Arab Emirates

Reply with quote
Three weighings is required to know.

_________________
*(`'.(`'.**.').')*
`.Shakeel Ahmed ..`
*(.'(.'**`'.)`'.)*

(((**A happy person is not a person in a certain set of circumstances, but rather a person with a certain set of attitudes**))
Sun Dec 23, 2007 12:23 am View user's profile Send private message Send e-mail Yahoo Messenger MSN Messenger
askari.z55
Senior Proud Pakistani
Senior Proud Pakistani


Joined: 15 Nov 2007
Posts: 1729
Location: UAE

Reply with quote
shakeelmscw wrote:
Three weighings is required to know.


100% Right

Same Brilliance Repeated


_________________
"O son of Adam if you have collected anything in excess of your actual need you will act only as its trustee for someone else to use it.""(Imam Ali(a.s))"
Sun Dec 23, 2007 12:53 am View user's profile Send private message Visit poster's website Yahoo Messenger MSN Messenger
shakeelmscw
Shayari Moderator
Shayari Moderator


Joined: 22 Aug 2007
Posts: 5392
Location: United Arab Emirates

Reply with quote
it was more tricky

_________________
*(`'.(`'.**.').')*
`.Shakeel Ahmed ..`
*(.'(.'**`'.)`'.)*

(((**A happy person is not a person in a certain set of circumstances, but rather a person with a certain set of attitudes**))
Sun Dec 23, 2007 12:55 am View user's profile Send private message Send e-mail Yahoo Messenger MSN Messenger
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