# Coin weighing - heaviest or lightest

I have 6 coins
Each coin has different weight
I can weigh as many coins at a time on a scale (for example I can weigh 3 vs 2)

I want to determine which coin is second heaviest or second lightest in least possible weighings. How do I do that?

• Ask the other scale what this one would do if Monte asks it to switch curtains. Nov 21, 2022 at 17:43
• Are you just making these up without finding the solution yourself? Nov 22, 2022 at 3:42
• @ParclyTaxel I'm not really sure how it goes here. Do I post a puzzle and then an answer in the comments straight away? Nov 22, 2022 at 8:42
• The thing is, most puzzlers in here will get tired if you post a puzzle that is very similar to a puzzle asked the previous day. Especially if you posted the previous puzzle. Nov 23, 2022 at 4:48
• @ParclyTaxel Oh okay, thank you for the clarification then. Nov 23, 2022 at 9:17

Seven weighings are required in the worst case. Weigh three pairs $$A. Then sort $$A using 3 weighings. Then the second-lightest coin is the lighter of $$B$$ and $$C$$.