expert
Expert with best answer

Vlad

97% Recommendation Rate

379 Meetings

5,969 Q&A Upvotes

USD 189 / Coaching

3

Case Math

Hi,

in an interview I had to solve a problem, which ws conceptually easy, however, to get to total sales I had to solve this: 2*480*360*16*365*0.7

This is perfectly doable, but took me some time. How would you go about it in terms of simplifying and rounding?

Thanks!

Hi,

in an interview I had to solve a problem, which ws conceptually easy, however, to get to total sales I had to solve this: 2*480*360*16*365*0.7

This is perfectly doable, but took me some time. How would you go about it in terms of simplifying and rounding?

Thanks!

3 answers

  • Upvotes
  • Date ascending
  • Date descending
Best Answer
Book a coaching with Vlad

97% Recommendation Rate

379 Meetings

5,969 Q&A Upvotes

USD 189 / Coaching

Hi,

4 skills might be used here:

  • Get used to round up and down (but ask the interviewer if that's ok)
  • Learn how to multiply double digit numbers (https://www.youtube.com/watch?v=6ndkkPZYJHo)
  • Learn the division table up to 1/11 (i.e. 5/6 = 83.3)
  • Get used to working with zeros using the powers of 10 (Hint: 4000000 = 4*10ˆ6)

Best!

Hi,

4 skills might be used here:

  • Get used to round up and down (but ask the interviewer if that's ok)
  • Learn how to multiply double digit numbers (https://www.youtube.com/watch?v=6ndkkPZYJHo)
  • Learn the division table up to 1/11 (i.e. 5/6 = 83.3)
  • Get used to working with zeros using the powers of 10 (Hint: 4000000 = 4*10ˆ6)

Best!

Round: 2 x 500(rounded up) x 400(rounded up) x 16 x 300(rounded down to compensate for previous roundings) x 0.7 = 1.34B. The precise answer is 1.41B, so it's within 10%.

Round: 2 x 500(rounded up) x 400(rounded up) x 16 x 300(rounded down to compensate for previous roundings) x 0.7 = 1.34B. The precise answer is 1.41B, so it's within 10%.

My guess is you need to estime the result rougthly and not go through hard computation. The idea here is to round the numbers

2*48*10*36*10*16*365*0.7 ~ 96*10*36*16*360*7 ~ 100*10*36*36*10*16*7 ~ 10^4*1296*112 ~ 10^5*1296*11~10^5*13*100*11~143*10^7. So rougthly speaking 1.4 billion

My guess is you need to estime the result rougthly and not go through hard computation. The idea here is to round the numbers

2*48*10*36*10*16*365*0.7 ~ 96*10*36*16*360*7 ~ 100*10*36*36*10*16*7 ~ 10^4*1296*112 ~ 10^5*1296*11~10^5*13*100*11~143*10^7. So rougthly speaking 1.4 billion

Related BootCamp article(s)

Typical Question Types in Written Tests

Questions among all tests can be categorized in math, GMAT-style, chart reading and brain teaser questions. Each type needs to be approached differently.

Which companies are currently using written tests ?

All major firms like McKinsey, BCG and Bain use tests to assess a candidate's analytical skills. However the design of those tests can differ a lot.

Guide to Improving Speed in Written Tests such as the PST

Follow these instructions to significantly improve your performance and speed in solving problem solving tests used at McKinsey, BCG and Bain.

Related case(s)

REA Reinsurance

Solved 10.4k times
REA Reinsurance Your client, REA, is a reinsurance company. REA recently acquired another reinsurance company (approximatively same size): the choice of this company was notably based on its product portfolio as well as its market presence which appeared complement with REA. However, the acquisition is not well received by the market. The acquisition price is considered too high and the transaction has not been well graded. REA management asks you to evaluate the transaction.
4.1 5 920
| Rating: (4.1 / 5.0)

Your client, REA, is a reinsurance company. REA recently acquired another reinsurance company (approximatively same size): the choice of this company was notably based on its product portfolio as well as its market presence which appeared complement with REA. However, the acquisition is not well r ... Open whole case

AirService

Solved 4.9k times
AirService Your client AirService is the service provider for a number of airports. The management realized a decrease in profits that is linked to increasing costs. How would you help them?
3.8 5 790
| Rating: (3.8 / 5.0)

Your client AirService is the service provider for a number of airports. The management realized a decrease in profits that is linked to increasing costs. How would you help them? Open whole case