Sample Question #78 (brainteaser)
Why are manhole covers round?
(Comment: this is one of the sample brainteaser-type case questions in Chapter 4 of my book; click Read comments to see the answer!)
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Sample Question #78 (brainteaser)
Why are manhole covers round?
(Comment: this is one of the sample brainteaser-type case questions in Chapter 4 of my book; click Read comments to see the answer!)
Quant Career Guide 
ANSWER
First of all, you should tell the interviewer that not all manhole covers are round, and they don’t have to be round! Otherwise, you can find a bunch of answers here:
http://en.wikipedia.org/wiki/Manhole_cover#Why_are_they_generally_round.3F