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Anonymous A
on Jul 18, 2025
USA
I want to receive updates regarding this question via email.

Interviewer Answer Key Wrong - How to Respond?

Hello,

I recently had a case interview and was struggling on the math. The interviewer and I agreed on the numbers until the second to last step, where let's say I kept getting the final answer as 7050. After struggling for a while, the interviewer told me the answer was 7500. We then ran out of time. Going through the steps again, I am almost certain that his answer key had wrongly written the answer as 7500 instead of 7050, especially since we aligned on everything up to the second to last step which only included some simple arithmetic. However, he was a partner so I assume he was familiar with the case/may have given it before (unsure). Is there anything I can do about this/what should I do?

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Han
Coach
on Jul 19, 2025
Ex-Mckinsey EM| Experienced round 1 interviewer | Free 15mins intro call

Hi there, 

Short answer is - what is done is done, not much you could do at this point, but also no need to be overly worried about it. 

Consulting case library refresh regularly, and for partner case (I assume this may be a final round?) it may not even be a formal case. Here is a post that discusses this in more detail. 

However, if the rest of your case went well, you may still have a fairly good chance to pass. If anything, this partner admitted in the end that you were right, so I doubt he would penalize you for running out of time. Would just focus on what will come next and think what you wish you've done better this time. 

Best,

Han

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Jenny
Coach
23 hrs ago
Ex-McKinsey Manager | 200+ Case Interviews | Coaching to problem solve confidently, going from good to great

Hi,

Ideally you would have had enough time to walk the interviewer through the calculations so that the interviewer could see for themselves that it's incorrect. If the interview is already done and over then there's nothing much you can do about it.

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