Answers.com > Wiki Answers > Categories > Entertainment & Arts > Games > Brain Teasers and Logic Puzzles > There are nine balls and a balance not a scale One of the balls is lighter than the rest How do you find the lighter ball by using the balance only twice How do you do it?

There are nine balls and a balance not a scale One of the balls is lighter than the rest How do you find the lighter ball by using the balance only twice How do you do it?

In: Brain Teasers and Logic Puzzles, IQ [Edit categories]

Answer:

First balance

Divide the balls into three groups of three. Put two groups on the balance, three balls per side. If they balance, the lighter ball in the third group. If one group is lighter (that side of the balance is higher), it's in that group. (You have determined which group of three the lighter ball is in, and now identify it with a second use of the balance.)

Second balance

Take any two of the balls from the group of three that contains the light ball and put them on the two sides of the balance. If they balance, it's the third ball. If they don't, it's the one that's higher in the air.

First answer by Bexsabe. Last edit by Bexsabe. Contributor trust: 167 [recommend contributor ]. Question popularity: 2 [recommend question].

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