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If 9 boy working 15/2 hrs a day finish a work in 20 days, then how many days will be taken by 12 boy working 6 hrs a day

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If 9 boy working 15/2 hours a day can finish a work in 20 days, then how many days will be taken by 12 boy working 6 hours a day to finish the work, it being given than 3 boy of latter type work as much as 2 boy of he former type in the same.

posted Dec 2, 2015 by anonymous

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