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maths
Posted: Fri Mar 09, 2012 9:27 am
by slush
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
Re: maths
Posted: Fri Mar 09, 2012 9:41 am
by Minesatea
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!
Re: maths
Posted: Fri Mar 09, 2012 10:42 am
by NOTLEY PARENTS
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.
Re: maths
Posted: Fri Mar 09, 2012 3:43 pm
by arsen
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!