perplexus.info :: Weights and Scales : Twelve Coins and a Broken Scale

Twelve Coins and a Broken Scale (Posted on 2005-06-24)

You have 12 coins, six weigh 24 grams and six weigh 25 grams. You also have the broken scale from Five Weights and a Broken Scale.

Sort the 12 coins into the group of 24g coins and the group of 25g coins using that broken scale no more than 9 times.

See The Solution Submitted by Brian Smith

Rating: 3.6667 (3 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)

re: Solution, I think.

| Comment 2 of 9 |

(In reply to Solution, I think. by Cougar Draven)

And if the second weighting also indicates "equal"?

I'm afraid this doesn't work -- for example, if you took two 24g coins, you'd place one in the 24g pile (OK) and the other in the 25g pile (wrong).

Posted by Federico Kereki on 2005-06-26 01:34:23

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