HealthEdge Software
Work in HR? Unlock Free Profile

HealthEdge Software Technical Support Engineer Interview Question

I interviewed in Burlington, MA and was asked:
"If you had 9 marbles, all the same size. One is heavier than the rest. You have a balance scale. How do you determine the heavy marble in the least number of moves."
Tags: logic, problem solving
Add Tags [?]

Part of a Technical Support Engineer Interview Review - one of 2 HealthEdge Software Interview Reviews

Answers & Comments

of 0

I suggested going in half.. 4 marbles each. The heavier group then divided 2 and 2, then 1 and 1. If it balanced, the extra is the heaviest. The answer was using 3 each. That would identify the set of marbles faster by one move.

- Interview Candidate on May 29, 2012
of 4

The answer is 2.
Group them into 3 marbles each.
1. Weigh any 2 groups first
          - Find the heaviest group. If both are equal then the 3rd group is heaviest.
2. Now follow step 1 with 1 marble and you can find the heaviest.

- Shakthi, Amazon on Jun 5, 2012

To comment on this question, Sign In with Facebook or Sign Up

Tags are like keywords that help categorize interview questions that have something in common.