Schedule mock interviews on the Meeting Board, join the latest community discussions in our Consulting Q&A and find like-minded Case Partners to connect and practice with!
Back to overview

How much concrete is used on the island of Manhattan?

I'm interested in seeing a structure to a question that appears impossible/overwhelming , such as

"How much concrete is used on the island of Manhattan?"

How granular of a level is both reasonable for the interviewee and satisfactory as an answer for the interviewer?

3 Answers
3.7k Views
4
Be the first to answer!
Nobody has responded to this question yet.
Top answer
on Apr 03, 2018
#1 Coach for Sessions (4.500+) | 1.500+ 5-Star Reviews | Proven Success (➡ interviewoffers.com) | Ex BCG | 10Y+ Coaching

Hi Anonymous,

you can consider the following steps:

  1. Identify where concrete is used; as besides buildings its main use is for bridges and other viability infrastructure, you could probably consider buildings only if the interviewer agrees
  2. Estimate the number of districts of NY with concrete. You should not includes parks and other parts without buildings
  3. Estimate the number of units using concrete per district – eg how many buildings per district
  4. Estimate the amount of concrete per building as percentage of the total volume of the building walls
  5. Multiply 2*3*4 for each segment identified in step 1

Best,

Francesco

on Dec 12, 2022
Concrete is the most widely used manmade material on earth. 40 million tons of the stuff is poured every year and the world consumes 150 billion tons each year. The concrete used on the island of Manhattan weighs 900,000 tons. It would take 225 trucks to carry that much concrete with Slabjacking. The Empire State Building weighs 7,000,000 tons. How much concrete was used in the building?
Vlad
Coach
on Apr 02, 2018
McKinsey / Accenture Alum / Got all BIG3 offers / Harvard Business School

Hi,

  • You can calculate the number of blocks (Streets an avenues on Manhattan) and the usage of concrete per block.
  • I would split Manhattan blocks into 2 types with heavy (skyscrapers) and non-heavy construction and estimate the usage of concrete in each type of the blocks. 
  • Don't forget to subtract Central Park from the total number of blocks

Best

Anonymous
on Apr 02, 2018

To elaborate on other answer, for each block then you take an assumption of what is empty vs. Concrete volume by multiplying the width and length of block by the avg height of building and then assuming a “density factor” (I.e. how much space in a cubic meter is concrete vs. Empty) and then multiply by the number of blocks with the distinction of high vs low density.

Andrea

4
Similar Questions
Consulting
Einstieg bei einer Top-Beratung (McKinsey, BCG, Bain, Roland Berger)
on Nov 11, 2015
Global
1 Answer
14.0k Views
Top answer by
32
1 Answer
14.0k Views
Consulting
Difference between first round and second round interviews?
on May 28, 2020
Global
18 Answers
25.3k Views
Top answer by
Anonymous
26
18 Answers
25.3k Views
+15
Consulting
Market Sizing Case Question: How big is the market for physicians in the US?
on Dec 12, 2015
Global
3 Answers
14.6k Views
Top answer by
Anonymous
19
3 Answers
14.6k Views
How likely are you to recommend us to a friend or fellow student?
0 = Not likely
10 = Very likely
You are a true consultant! Thank you for consulting us on how to make PrepLounge even better!