IIM k interview

[da_supertalent]

could get a bit closer to actual value if u take the boeing 747 as a cone + cylinder, but in this case we'll need length which i cannot get without dear ol frnd google

BUT if there are 400 ppl, let's assume that there are 4 in a row (2-aisle-2), which means 100 rows. space is lil more than a bus seating arrangement which means each row is abt 75 cms (back of ur seat to back of frnt seat)

so 100*75 = 75 m

WAIT!, that looks like a ridiculous no!

guess this is when the interview panel has me certified insane and they run out of the room screaming

[MavericK]

abbey oye..PI mein itna time nahin milta
so just make a confident guess just like i did

[D e e p t i]

Originally Posted by anil

confident guess

Hmm thats interesting.. But you still did not Justify ya answer!!

[MavericK]

Originally Posted by Trinity

But you still did not Justify ya answer!!

do i need to justify a Guess ???

[pagalneha]

acc to my teacher in cl he said that we shud have said sommething kike that there was a survey held and acc. to that survey fopr every 10 pll u have 1 dog and knp's. pop. is 40,00,000 so there will b these no. of dogs............... and so on

[MavericK]

Originally Posted by nehachaudhary

acc to my teacher in cl he said that we shud have said sommething kike that there was a survey held and acc. to that survey fopr every 10 pll u have 1 dog and knp's. pop. is 40,00,000 so there will b these no. of dogs............... and so on

and wat abt street dogs?? and accounts for the sheep plzz

[NewView]

Originally Posted by da_supertalent

well googling is an art!

but seriously the question is somethin co.s like mckinsey/bgc/bain etc. would ask..
here's a question along the same lines -

how many ping-pong balls can u fit in a boeing 747??

ne1 gonna take a shot at this?

googling is not allowed!

Found this interesting and hence posting though the thread is pretty old.

A TT ball is 40 mm in dia (Earlier it was 38 mm. I am a TT player)
assume that it fits into a cube of 2r side (40 mm here). Then it occupies 4/3*pi*r3/(2r)3 ~ .5 of the space = half the space.
therefore it is safe to assume that the total volume of the TT balls fitting in the space is half of the total vol of the plane.

vol of tt ball = 4/3*pi*(.02)^3 ~ 3.3 * 10 ^ -5 m^3

Consider a plane to be a vast cuboid.
I think 747-400 means that it can carry 400 ppl.
each economy seat person gets ~ 1*.75*4 mtr space and there should be abt 350 aconomy seats. there are 6 seats in economy class in a row + 2 rows equivalent of aisle space. => 1*.75*4*8 mtrs = 24 mtr^3. (same row space in economy as well as business class)
In business class has only 4 seats in a row.
350 economy/6 + 50 business/4 = no of rows ~ 71
=> seating space = 71*24 m3 ~ 1700 m^3
add 2 additional rows for the exits - main and emergency.
=> 1750 m^3
add cockpit space ~ 3 rows => 1825 m^3
I am assuming that only the seating space and the cockpit are used for filling up the TT balls.
therefore no of balls = 1825/(2*3.3*10^-5) ~ 27360000.

Vaibhav.

P.S : no googling or 'calculator'ing was done in arriving at the above answer.

[THUSSU]

regarding the ping pong balls, it all depends on whether the seats are still there or have been removed. also, if the loo there is something like the ones in trains, you could keep dropping balls down the drain...

[CATveteran]

Well i think what the interviewers look in such kinda Qs is essentially the thought process and how logically a person is arriving at a figure. They are not keen on correct answer or something. I dont think that guessing any no. or saying i dont know would do...cuz in the first case am sure the next q will be how do u arrive at this figure...and in the second case it might appear that u are not trying to think... cuz no one is anyway expected to know how many dogs or sheep are there in a particular city.
Another motive of such kinda Qs is to stress u out to see how well do u perform after that. Particularly i have seen that happen with guys who write " perform well under stress" as one of their strengths...
Do lemme know what u guys/gals think of this...

God bless

Ravi

P.S. : these are just my views..i dont mean to offend anyone...

[rajatb]

Originally Posted by NewView

Found this interesting and hence posting though the thread is pretty old.


I am assuming that only the seating space and the cockpit are used for filling up the TT balls.
.

Guys none of you seem to remember ur basic courses in physics
Remember Crystal Structures???
The way you are calculating is all wrong whatever assumptions you make bout the dimensions of the plane cause the ping pong balls being spheres will have to placed in such a way such that space will remain trapped in between...

now you have to choose whether you wanaa go in for Cubic Close packing or Hexagonal Close packing ,do some more googling and you will find which of these give the highest packing fraction use that calculate the no of spheres in 1 unit cube,then the vol of that cube ant then you can divide the volume of the plane by the vol of cubes to get total no of cubes,u will know no of ping pong balls in 1 cube,volia u get the no of ping pong balls.