Tough Interview Questions: The Ratio of Boys to Girls

The Ratio of Boys to Girls

The full question is: In a country where people only want boys, every family continues to have children until they have a boy.  If they have a girl, they have another child.  If they want a boy they stop.  What is the proportion of boys to girls in this country?

Now, this is a math problem and I’m just going to walk you through the solution.  

The answer is going to be I pretty much a one-to-one ratio.

So, for example, let’s say there are n couples.  There will be n boys and there is will be an infinite sum of girls equal to n/2 plus n/4 plus n/8 plus (and you keep going).

So, this translates into all these numbers add up to a sum of “n.

So, the proportion of boys to girls winds up being pretty close to one to one with perhaps a few more boys than girls because the sum isn’t infinite.   

So, again, the math problem reads in over n/2 plus n/4 plus n/8 on and on and on all of which is ultimately going to add up to “n.”

So, at the end of the day, it’s can be pretty much a one-to-one ratio.


Ⓒ The Big Game Hunter, Inc., Asheville, NC 2020 



Jeff Altman, The Big Game HunterJeff Altman, The Big Game Hunter is a coach who worked as a recruiter for what seems like one hundred years. His work involves career coaching, all as well as executive job search coaching, job coaching, and interview coaching. He is the host of “No BS Job Search Advice Radio,” the #1 podcast in iTunes for job search with more than 1900 episodes, and is a member of The Forbes Coaches Council.

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