@gizmotech said:

@mba4viplav Hey, Thanks for the reply.I was wondering if you could substantiate your claim that number is not required until asked by the interviewer. Asking questions is fine if it's allowed by the interviewer and if the estimate falls under a case question. But, if these numbers are provided then it's no longer a guesstimate, it becomes an approximation. Like if we take the case of painting a Boeing 747 the way you explained it.

@pawanponting said:

question ) Estimate the number of trees in your colony/city/particular area etc.Answer ) City = New Delhi .... Area = 1500 square kmNow to estimate number of trees in Delhi first we have to divide Delhi in 4 different zones in terms of Tree density ... Average area covered by single tree = 10 mtr therefore we need 100 trees standing next to each other to cover 1 Sq km of area.Zone 1 = High Density - which is approx 45% = 675 sq km. Now say in this area the total area covered by trees is 40% of entire area = 270 sq km therefore we will have 27,000 trees hereZone 2 = Medium Density - approx 30% = 450 sq kmNow say in this area the total area covered by trees is 25% of entire area = 112.5 sq km therefore we will have 11,250 trees hereZone 3 = Low Density - 15% = 225 sq km Now say in this area the total area covered by trees is 15% of entire area = 33.75 sq km therefore we will have 3375 trees hereZone 4 = Dry Area - 10% = 150 sq km Now say in this area the total area covered by trees is 10% of entire area = 15 sq km therefore we will have 1500 trees hereTotal trees = 27000 + 11250 + 3375 + 1500 = 43, 125

@cheetahdsaka said:

What would be the approach for the 4th question regrading paint required for boeing 747?? Wondering !!!

@gizmotech said:

HiThe first day of the month might not necessarily lead to a huge number of withdrawals because people receive salaries in their accounts on different dates. They might use other facilities like cash withdrawal etc to withdraw money or might not withdraw money at one go but at a staggered pace.Assuming historical data doesn't make sense to me. However, if you have it, you should definitely use to to project figures. And, you should provide a logic for the particular percentage inc or dec that you have mentioned.

@abhidutz said:

gud stuff....i would apply additional dimensions to drill it down further by1.festive seasons (more cash needed)2.first week of every month(salary comes in so do more transactions)3.location of ATM (in a mall or resident colony or in a deserted place.withdrawals depends accordingly)I have a ques.is it ok to use(or assume) historical data and then try to predict growth/slump by inculcating current senarios....

@gizmotech said:

Hi,I have written below the way I attempted the question without reading pawanponting's solution.I take the example of an ATM in a big mall like great India Place, Noida. The number of footfalls in the entire day has been estimated to be 10,000 on Weekdays and 15,000 on weekends.Say, only 20% of people actually buy stuff and rest are either tag-alongs or window-shopeers or didn't find what they were looking for. 2000Out of them only about 10% people would need extra cash which would require the to use an ATM. This leaves us with 200 people. This would also include people who did not have a pre-planned agenda and therefore, did not have money in advance.If there are six ATMs in the building, with preference of ATMs related to the banks, only 16.66% people out of 200 would use our particular ATM.So, only 33 people would use that ATM. Assuming an average transaction of Rs. 3000 considering that items in malls are costly and people would be carrying cash upto Rs. 1000.This adds upto to approx 5 lakh rupees for five days.For weekends, this comes out to be 3 lakh rupees for the weekend.This brings the total upto: 8 lakh rupees.

@ManaginBug said:

@gizmotech Buddy another tricky one:No of movie goers in metropolitan in India (includes delhi + NCR , Mumbai , Chennai , Kolkata , hyderabad, Bangalore )..

@ManaginBug said:

@gizmotech Thank you buddy... Another one:Number of Black cars in Delhi + NCR??My Approach:PopulationDelhi - 2.04 crNoida - 6.4 lGurgaon - 17 lGhaziabad - 10 lFaridabad - 1.4 lGreater Noida - 1 lTotal - 2. 4 croreAvg. family of 4 has 1 carTotal cars therefore comes down to 2.4/4 = 0.6 croreProminent colors - Silver/ Metallic , Black/Grey , White , Odd colors (red, green etc.)So eventually black cars = .6/4 = .15 crore..WHats ur take..!!

@ManaginBug said:

some body please try n estimate the number of air conditioners in Delhi.. need to look at the approach.. the biggest nemesis.. is in taking the account of the MNC's and small house companies..!!

@Divyanalyst said:

@gizmotech : My comment is with refernce to guestimate case of bat industry

@Divyanalyst said:

@gizmotech Nice Solution but one biggest loophole is that the female population is not taken into consideration

@gizmotech said: : 1) Estimate the sales of Maruti Swift Dzire in 2012-13.

@pawanponting said: if we talk about 0.1% playing in north India I have strong evidence to go with that: Look the states covered here are: Haryana Punjab Delhi Himachal Pradesh Jammu Kashmir Now every state has follwoing categories : Schools and Open CategoriesIn Schools we have under 12 , under 15 , under 17 competingIn Open we have under15 , under 17 , under 19 , Under 22 , under 25 and then open age Total of 8 age groups in every district of every state. even if in every age group in every state there are 200 players only then we have approx 1600 players in every district. To be close say we have 1500 players in every district playing official cricket. Haryana has 28 districts , Himachal has 21 , Jammu and Kashmir has 35 , Punjab has 19 = 103 districts therefore total of 103*1500 = 154500 players playing official cricket excluding delhi Delhi case Now:- In every age category you will easily find 1000 players in delhi at least I am saying which makes 8,000 players in delhi only Rounding off we have close to 1.6 lakh playing official cricket only mate. Consider 25% of this to be gully players even then we end up at figure of 2,00,000Note:- PupPonting is Ex player of Chandigarh And Haryana in Age groups under 15 , 17 , 19 , 22 and Open age group.

@gizmotech said:

umm..interesting. I keep forgetting this. You have given a very nice suggestion. Whenever one is unsure, one can quote two figures (upper bound and lower bound) to remain safe. Also, use market segmentation often to arrive at a closer answer. But, this was a very broad problem so didn't feel like exploring further

Yea dis was, even i was stumped ven 1st aked dis q as its too vague to give an ans n hence i gave max min type ans :D