You have five coins, apparently alike, but actually of different weights. You also have a two arm scale.

Can you manage to sort the coins in ascending order, using the scale only seven times?

Bonus question: can it be done in fewer weighings?

I think it's possible to do it in 4 weighings, but you'd have to get lucky. It could take as many as 10 weighings to be absolutely sure.

Posted by Danny on 2004-05-31 09:53:08