68 Coins, 100 Weighings

unknown-author
Unknown Author September 22, 2019
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Section: Brain Teasers Category: Insight
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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)

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