Interview: how many photos were taken in one day

Question

Recently I was asked this question in an interview "How many photos were taken in one day around the world . " I know him is vague, but I tried to ask the interviewer a lot of questions to get more information from him, but in the end, the interviewer asked me just to give me a number

My answer : 4 billion
Interviewer : Why?
Me : because I like the number "4 billion"
Interviewer : fell into a laugh

And then after he moved on to other issues

What is the interviewer trying to do from my answer and what could be the reason he asked?

Change . Interview was for QA Engineer Position

Answer 1

In my opinion, such questions are a way to evaluate the ability of logic and think out of the box of the interviewee.

Here's another example: Australia's light bulb market , although this is for a different industry and therefore a higher level of expectation is the answer.

Bonus (not 100% related to the question): Another typical question for the QA position is how to check the elevator , and do not confuse it with the elevator test .

Answer 2

This is what Joel Spolsky refers to as a "question back to the envelope."

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Answer 3

This is a Fermi question designed to test assessment skills.