3 men or 5 women can do a work in 12 days. How long will 6 men and 5 women take to do it?
Number of days required by 3 men to finish the work : 12 days
Number of days required by 5 women to finish the work : 12 days
Number of days required by 1 man to finish the work : 3 x 12 = 36 days
Number of days required by 1 woman to finish the work : 5 x 12 = 60 days
Work done by a man in one day: 
Work done by a woman in one day: 
Work done by 6 men in one day: 6 x 
= 
Work done by 5 women in one day: 5 x 
= 
Work done by 6 men and 5 women together in one day: 
+ 
= 
= 
6 men and 5 women together take 4 days to complete the work.
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