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 Post subject: mathsPosted: Fri Mar 09, 2012 8:27 am

Joined: Wed Jan 11, 2012 8:36 pm
Posts: 18
Hi

Would anyone be kind enough to help with this maths question.

8 people take 10 hours to do a certain job, how long would it take 20 people to do the same job?

Thanks You

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 Post subject: Re: mathsPosted: Fri Mar 09, 2012 8:41 am

Joined: Fri Oct 30, 2009 11:08 pm
Posts: 1234
Not sure, but:

If 8 people take 10 hours each that is 80 man hours in total ie 1 man would take 80 hours to do the job.

20 people should thus take 80 / 20 = 4 hours

I think!

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 Post subject: Re: mathsPosted: Fri Mar 09, 2012 9:42 am

Joined: Wed Sep 23, 2009 2:09 pm
Posts: 178
Location: Great Notley
Minesatea wrote:
Not sure, but:

If 8 people take 10 hours each that is 80 man hours in total ie 1 man would take 80 hours to do the job.

20 people should thus take 80 / 20 = 4 hours

I think!

I make it 4 hours too.

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 Post subject: Re: mathsPosted: Fri Mar 09, 2012 2:43 pm

Joined: Sat Nov 19, 2011 6:14 pm
Posts: 25
It is 4 hours.

You are basically increasing the number of people by a factor of 2.5. (8x2.5=20), therefore you would be decreasing the time taken by 2.5. So 10/2.5 = 4

Hope helps!

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