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Weighty Balls

You have eight balls all of the same size. 7 of them weigh the same, and one of them weighs slightly more. How can you find the ball that is heavier by using a balance and only two weighings?

 

 

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Solution

Weigh 3 balls vs 3 balls.

If one side is heavier, weigh one vs one of those three.  If they are equal, the third is the heavier one (and if not, the heavier is heavier).

If the 3 vs 3 is equal, weigh the two remaining balls and see which is the heaviest!


Difficulty
    • Moderate
      		Type
        • Logic


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