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Advice
Millions! A rough estimate might be 25 million. The interviewer really wants to hear how you come up with your estimate. Reasonable logic might be that manholes serve the sewer system which needs to serve homes and businesses. If the U.S. population is roughly 320 million and there are roughly 2.5 people per household, there are about 128 million households. One manhole on the sewer system might support 5 homes which would mean that there are about 25 million manhole covers. Feel free to pull out your calculator during the interview or ask for a calculator!
Answer examples
"Likely over $20 million. A great way to verify this would be though the EPA or by understanding how many households per manholes, then work the math."

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User-Submitted Answers

1.
Slightly less than there are manholes, because they are heavy and scrap is valuable.
2.
Between 100 to 150 million.
3.
Enough too fill every hole I hope.
4.
As many as to cover all the manholes in usa.
5.
As enough covers to cover the manhole.
6.
I don't know, does anyone know that?
7.
Too many, but I believe it good for the environment.
8.
I have no idea, but I'll bet there is a record of it some where.
9.
I don't know, but I can help you find out.
10.
I haven't come across any so there must be a lot in other parts of the country.
11.
I do not even know what that is.
12.
I think, I can't give you the right answer to the question.
13.
I hope as many as the manholes plus spare few.
14.
No idea ... But I jus noticed three of them on my way to interview.
15.
500 hundred thousand and counting.
16.
Not sure but I can find that answer for you.