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work and rate problem

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Intern
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work and rate problem [#permalink] New post 10 Apr 2010, 19:36
25 men reap a field in 20 days . when should 15 men leave the work.if the whole field is to be reaped in 37-1/2 days after they leave the work?

A 5 days
B 10 days

I am not quite sure how to solve this. could somebody help me!
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Joined: 18 Jun 2009
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Concentration: Strategy, General Management
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Re: work and rate problem [#permalink] New post 11 Apr 2010, 03:29
Re: work and rate problem   [#permalink] 11 Apr 2010, 03:29
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