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3 men or women can do the work in 12 days.
1 man or woman can do the work = 12×3 = 36 days.
1 man or women will do in 1 day = 1/36 of the work.

6 men in 1 day will day do =  \frac{1}{36} \times 6= \frac{6}{36}   of work
5 women in 1 day will day do =  \frac{1}{36} \times 5= \frac{5}{36} of work

together they can do in 1 day =  \frac{5}{36}+ \frac{6}{36}= \frac{5+6}{36}= \frac{11}{36}    of the work

They will complete in =  \frac{1}{11/36}= \frac{36}{11}  days
1 5 1
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