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If w women can do a job in d days, then how many days will

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If w women can do a job in d days, then how many days will [#permalink] New post 12 Apr 2008, 12:10
If w women can do a job in d days, then how many days will it take (w+n) women to do the job if all the women work at the same rate?

a) dw/(n+w)
b) (n+w)/d
c) (n+w)/dw
d) d(n+w)
e) d(n+w)/w
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Re: women [#permalink] New post 12 Apr 2008, 12:12
fast solution: if n~10000000000, d has to be ~0. Only A works.
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Re: women [#permalink] New post 12 Apr 2008, 12:48
Sorry, Walker, didn't get it.Could you please explain the solution.
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Re: women [#permalink] New post 12 Apr 2008, 13:00
the usual way:

we can write two equations:

A=w*d, where A is total amount of job.
A=(w+n)*x, where x is the number of days, required for w+n women to do A.

w*d=(w+n)*x --> x=w*d/(w+n)

fast approach: It is obviously that more women (n increases) lead to fewer days to perform the same job. So, if we put a huge n, we have to obtain ~0. All options, except A, increase when n increases.
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Re: women [#permalink] New post 12 Apr 2008, 13:08
Tnx. Now it's clear
Re: women   [#permalink] 12 Apr 2008, 13:08
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