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What is the weight of Boeing 747?

Rishabh

Taking airplane is empty.

Weight overall = Body weight + Wheel Weight

NO of wheels in 747 is 18

Weight?

Body weight = volume of airplane * density

Can someone tell me the proper approach to this Guesstimate?

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Vlad replied on 04/02/2018
McKinsey / Accenture / Got all BIG3 offers / More than 300 real MBB cases / Harvard Business School

Hi!

This question is more a brainteaser and it's less about the actual weight but rather about how you will measure it.

You can use both non-creative and creative approaches:

1) You can weight each part of the plain separately: wheels, chairs, etc. Don't forget the paint

2) You can recommend tying a rope around the plane’s midsection, throwing that rope over a rafter at the top of the hangar and then attaching the other end of the rope to a large platform onto which you will quickly load bricks of a known and pre-defined weight until the plane lifts off the ground and then all you need to do is count the bricks.

Best

(edited)

Andrea
Expert
replied on 04/02/2018
Former BCG decision round interviewer with 300+ real interviews in 8 years

I think your approach is fine, but would augment by dividing the non empty volume in categories of materials (aluminium, foam, plastic) to be more precise.

Hope it helps,

Andrea