Back-of-the-envelope estimation for system design interviews Most people don't fail capacity math because the arithmetic is hard. They fail because they do it silently, produce a number they can't defend, and then never use it again for the rest of the interview. The math itself is trivial.

Source: [Dev.to](https://dev.to/tieroneprep/back-of-the-envelope-estimation-for-system-design-interviews-2k6e)

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