Why Are Manholes Round? The 10 Toughest Interview Questions

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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.