Why Are Manholes Round? The 10 Toughest Interview Questions

Are today's graduates prepared to answer these interview questions, testing resourcefulness and critical thinking skills?

Why are manhole covers round? How do you measure 4 gallons of water using only a 3 and 5 gallon jug? How many gas stations/dogs/windowpanes are there in the United States? According to career community Glassdoor.com, these are a few of the more obscure queries asked of wannabe Googlers.

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