Interview Question

Business Consultant Interview New York, NY

Find the heaviest out of 7 balls by using a scale only

  twice, and only one ball is heavier than the rest?

Interview Answer

1 Answer


pick out 1 ball and put it aside. Separate the rest of the balls into 2 groups(3 each). Measure the 2 group of balls.
If they are equally weighted, then the ball is being putting aside is the heavier one. If not, take out 2 balls from the heavier group, measure them, If they are equally weighted, the third ball from this group is the heavier one.

Anonymous on Jan 30, 2015

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