This is the classic brainteaser, straight to you from Microsoft (the originator). Even though this question has been around for years, interviewees still encounter it.
Here's how to "solve" this brainteaser. Remember to speak and reason out loud while solving this brainteaser!
Why are manhole covers round? Could there be a structural reason? Why aren't manhole covers square? It would make it harder to fit with a cover. You'd have to rotate the cover exactly the right way. Therefore, many manhole covers are round so they don't need to be rotated. There are no corners to deal with. Also, a round manhole cover won't fall into a hole because it was rotated the wrong way, so it's safer.
There may be other reasons why corners are a problem and why a round shape is better. You can't cut yourself on a round manhole cover. And because it's round, it can be more easily transported. One person can roll it.
This is question you are almost guaranteed to receive in any interview. And although you may think it's a softball question—one easily answered by spouting out a few facts gleaned from a Google search—this couldn't be further from the truth.
The "Start Big" approach: If you're not sure where to begin, start with the basic assumption that there are 320 million people in the U.S. (or 30 million businesses, depending on the question).
We’re under no illusions that this post is the first to address the question of what makes a “good” junior associate (given that a quick Google search will reveal numerous identical-sounding pieces). What makes this post different is the simplicity of our suggestions that can help you from Day One.
Greetings to all the aspiring entrepreneurs out there. Very recently we spoke about some common habits of the most successful entrepreneurs, and as promised, this time we’re going to tackle some of the biggest challenges new entrepreneurs face, along with effective strategies to overcome them.