68 Coins, 100 Weighings

You have 68 coins with different weights. How can you find both the lightest and the heaviest coins with 100 scale weighings?

1. Compare the coins in pairs and separate the light ones in one group and the heavy ones in another. (34 weighings)
2. Find the lightest coin in the first group of 34 coins. (33 weighings)
3. Find the heaviest coin in the second group of 34 coins. (33 weighings)

+ posts

We do not know where this puzzle originated from. If you have any information, please let us know via email.

Notify of
Oldest Most Voted
Inline Feedbacks
View All Comments