Number the balls 1 through 9. Weigh balls 1, 2, and 3 versus 7, 8, and 9. If the left side is heavier, write down 1; if the right side is heaver, write down 7; and if the two sides balance, write down 4.
Now weigh balls 1, 4, and 7 versus 3, 6, and 9. If the two sides balance, add 1 to what you wrote down after the first weighing; if the right side is heaver, add 2; and don't do anything if the left side is heaver. The result is the number of the heaver ball. E.g., suppose that on the first weighing, the left side is heaver, so you write down 1; and then on the second weighing the right side is heavier so you add 2. Then the heavier ball is ball number 3. Dave On Mar 25, 2:46 am, Lavesh Rawat <[email protected]> wrote: > *Weighing Problem Solution* > * > *There are 9 similar balls. Eight of them weigh the same and the ninth is a > bit heavier. > How would you identify the heavier ball if you could use a two-pan balance > scale only twice? > > Update Your Answers at : Click > Here<http://dailybrainteaser.blogspot.com/2011/03/25march.html?lavesh=lavesh> > > Solution: > Will be updated after 1 day > > Soln > > -- > Posted By lavesh to brain teaser > solutions<http://solution-dailybrainteaser.blogspot.com/2011/03/25march.html>at > 3/25/2011 12:01:00 AM > > -- > > "Never explain yourself. Your friends don’t need it and > your enemies won’t believe it" . -- You received this message because you are subscribed to the Google Groups "Algorithm Geeks" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en.
