Hi, You can use the rule of 72: 72 / 20 = 3.6 - 3.6 years takes it to double 6 / 3.6 = 1.5 - 1.5 times it will double 10M * 2ˆ1.5 = 30M If you google the rule of 72 you'll find tons of... (more)

# All questions tagged Math problem - Consulting Q&A - PrepLounge.com

and rise to the top

Hi! The market size of a player in this graph is equal to the area of all its squares. Just by eyeballing it you should be able to say that RetailCo is the market leader and Player A is the number... (more)

Hello, I would appreciate if anyone could help out with this quesiton. I do not understand the logic... (more)

Hi, The best way is to practice, but practice in a smart way. Here are some tips and tricks to be most effective: Practice in front of someone else. I see loads of candidates say they have p... (more)

Hi, Several sources can help: Take all available case books and go through all the math problems there. Even the ones without a graph can be relevant since the universe of potential math prob... (more)

Hi, I suggest the following: Do one full case from the mck website in 60 min. Check your score. Target score is 22 out of 26 correct. If you do 17-18 correct you have great chances to improve it... (more)

Hi! I have written this earlier, and I will repeat it: the obsession with "Mental Math" is one of the many damaging nonsense myths that are flying around! Mental math is simply not something that i... (more)

Hi, I recommend going through the GMAT math part and practice the equations there. There are many good books on that. Best

I don't think there's any hard & fast rule. If I feel like the math is getting a little more complex, or I have too many numbers to keep track of, I always err on the side of caution: better go a... (more)

Hi Anonymous, in general, the main issues with big numbers is forgetting zeros during operations. Potential tips to deal with big numbers are the following: Use correctly 10^ powers in your m... (more)

Hi Jana, It won't work where you have really ugly numbers but one trick to keep in mind is the 'invert and multiply'. So to use your case: 0.024/0.08 = (0.024/1) / (4/5)... (more)

20% margin means C = 0.8*P. If new price is 0.95*old price, then new margin is 0.95*P - 0.8*P=0.15*P, so your new margin is 15%. New volume * P * 0.15 = Old volume * P * 0.2 (price is same her... (more)

Hi Jay, I'm a former McKinsey consultant, and I have a set of practice problems on several topcis that are more complex than mutlplcaiton or percentage calculations, like Breaekven Analysis, and mare... (more)

Hi guys! Just wondering if anyone has tried the FastMath Ace the Case course, and can give feedba... (more)

Hi, Something that helped my candidates - download ALL casebooks available online and go through the math problems in the cases. They will give a good sense of required business terminology. Then y... (more)

Hi, I recommend downloading all possible casebooks you can find. Quickly go through each case but concentrate on solving the math problems that they have. To be honest, the way they solve the case... (more)

Hi, There are several techniques that you can use: 1) Learn how to work with zeros. Best way - always use 10^power instead of zeros Example: 300x9000 = 3*10ˆ2 x 9*10ˆ3=3x9*10ˆ(2+3)=27*10ˆ... (more)

Hi Anonymous, first of all, let me state that one result of proper case interview preparation will be that this question will become completely irrelevant to you. ALL calculations in Consulting cas... (more)

Hi, Here is how you can improve your math skills: 1) Mental math - train, train, and train again Learn how to multiply double digit numbers (https://www.youtube.com/watch?v=6ndkkPZYJ... (more)