University of Toronto Interview Question: 9 balls in total and an old f... | Glassdoor

Interview Question

Investment Banking Internship Interview Toronto, ON (Canada)

9 balls in total and an old fashion scale. 1 of the

  9 weighs more than the other. how do u find out which is the off ball

Interview Answer

2 Answers


weigh them out 3 x 3

Interview Candidate on Mar 5, 2012

Weigh 3 balls, then weigh 3 more. If the 2 weightings are identical then the lighter ball has not yet been weighed, so replace one ball until you find it. If one of the weightings is lighter, go back to that configuration and remove one ball at a time until you see an inconsistent drop in weight.

Joseph on Nov 22, 2013

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