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Problem Solving (PS) | Re: 12 men who works for 10 hours a day can finish the work in 26 days

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using equation nRTE= W
where n = no of men/women
R = rate
T= time taken
E= Efficiency
W= work

12*26*19*0.9 = 20*T*6*0.6
Solving T gives 39

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