A focussed approach on solving the Guesstimate- How many cars would you find on Delhi roads?

Spread the love



The most important parts of solving a guesstimate are taking the right assumptions and solving them with proper logic. These are your subtle keys which you can use to unlock any kind of guesstimates.

What is evaluated during a guesstimate case study?

A Guesstimate is most likely to be asked in an analytics interview and sometimes acts as the deciding factor for recruiters to choose the right candidates for Business Analytics or even Consultant positions. The interviewer assesses the following KPIs in the interviewee :

  • -Ability to structured problem solving and breaking it down into logical parts in the MECE way
  • -Confidence with numbers
  • -Ability to comprehend and focus on various scenarios and their consequent effects


At Ivy Pro School students are trained not only on latest data Science technologies and tools like SAS,R,Python,Hadoop,Tableau, Machine Learning but also helped to prepare for analytics interviews. This is where preparation on Guesstimates comes in.

One of our previous articles on ‘How to solve Guesstimates‘ talked about how to approach such problems. Lets look at a real example and see how many of you get it right!

#Q : After the implementation of the odd-even rationing in Delhi, how many cars ply on the streets of the NCR?


We all know about the odd-even rationing in Delhi, just to brief you up:

It is a rule which is implemented to deprive half the population of a particular resource for the benefit of the entire population. The national union territory of India has been devastated with smog in its atmosphere! For the betterment of the dwellers of the city, the government has implemented this rule.

This rule had been declared around 11 months back, now there is a very interesting guesstimate which you might enjoy hacking!

DELHI NCR is the national capital city also known as the national capital territory of India. It is both a city and a union territory of India.

There are many approaches to think about this guesstimate-

The best way to find this out is deducing from the total population, and getting the answer. This is called the TOP-Down Approach

Let us first start with the options of transportation for the people of Delhi.

We are concerned with the population travelling in their own cars or Uber:

Basis our assumptions, total number of cars =10, 33, 333 ply on the streets of Delhi everyday

We need to remember that recruiters are not looking for the exact answer from you, but just the method that you have used to solve a particular Guesstimate problem.


READ MORE5-right-tips-for-a-successful-career-in-analytics/


Pro Tip for Guesstimate

     1. Practice makes it perfect

Don’t leave it on the D-Day. Practice and practice to perfect your approach

     2.   Practice with numbers

A key to succeeding at guesstimate questions is the adept ability to deal with numbers and swiftly. Also, its always a good idea to know a few numbers at the tip of your fingers (like the population of India/world population, ratio of males to females, population of a few major cities that you can apply to your answers and wow your interviewer.

     3. Practice everywhere

You can get the hang of these kind of questions only when you can develop the ability to question and add math to everything.That way you are prepared way beforehand for any curveballs that might come your way during the real interview!


A Guesstimate for your grey cells

Estimate the total number of ATM’s across India now. Leave your answers in the comment below and we will get back to you with the answers!


At Ivy, we introduce students to these concepts in Analytical Problem solving skills and Interview Preparation Skills. Ivy’s Students have been placed in more than 100 Top notches Analytics Companies. We offer Big Data Analytics and Machine Learning courses in Bangalore, New Delhi, Pune, Kolkata and Mumbai. Get in touch with us for information on our courses at info@ivyproschool.com or call/WhatsApp 9748441111.

Spread the love

Leave a Reply

Your email address will not be published. Required fields are marked *

Paste your AdWords Remarketing code here