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Oracle Senior Software Engineer Interview Question

I interviewed in Redwood City, CA and was asked:
"You have 10 boxes of balls (each ball weighing exactly10 gm) with one box with defective balls (each one of the defective balls weigh 9 gm). You are given an electronic weighing machine and only one chance at it. How will find out which box has the defective balls?"
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Part of a Senior Software Engineer Interview Review - one of 1,232 Oracle Interview Reviews

Answers & Comments

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Take 1 ball out of the 1st box, 2 balls out of the 2nd, 3 balls out of the 3rd, etc.... and then weigh all of the balls. Then take the total weight = 10*total number balls + x. Solve for x and that will tell you which box is defective.

- devpaul on Mar 7, 2013

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