Glassdoor Interview Question: "Suppose you had eight identi... | Glassdoor.ca

## Interview Question

Associate Account Manager Interview Chicago, IL (US)

# "Suppose you had eight identical balls. One of them is

slightly heavier and you are given a balance scale. What's the fewest number of times you have to use the scale to find the heavier ball?"
Answer

## Interview Answer

3 Answers

0

Group 1 Group 2
A B C D E F | G H

Weigh ABC vs DEF. If (for example) ABC is heavier then weigh A vs B. If A&gt;B then you have your answer, if A=B then C is the heavier ball. Same scenario follows for DEF.

If ABC = DEF then weight G vs. H and you are done.

2 is the most efficient way to do this.

MB on Jul. 3, 2019
0

Really good lessons to get into top tech companies:

bit.ly/faang100

Anonymous on Oct. 15, 2019

One or more comments have been removed.
Please see our Community Guidelines or Terms of Service for more information.

## Add Answers or Comments

To comment on this, Sign In or Sign Up.