Treebeard's Homepage : Stumpers

Treebeard's Stumper
September 19, 1997

We’re starting the year in science studying Oology, so here’s a classic stumper slightly modified to involve eggs. Suppose you have a dozen eggs that look and feel identical. All are equal in weight except one. You also have an old fashioned double arm balance. You can put any number of eggs on each pan of the balance to see which side tips or if they are the same. Can you find which egg is different in only 3 attempts if you know that the odd egg is heavier than the others? What if you only know that the odd egg is different (heavier or lighter), but you don’t know which?

Answer


last modified .

Marc Kummel / mkummel@rain.org