Answers

2016-01-18T11:27:29+05:30
10 man completed a work in 7 days,
10 women completed work in 14 days.
ie, 1 men productivity = 2 women
Hence, 5 men = 10 women
Hence, in effect we've 20 women. (5men & 10 women)

If 10women can do work in 14days, 20 women can do the same work in half the time (double number of workers) i.e 7days.
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2016-01-18T21:06:04+05:30
WORK DONE BY 10 MEN in one day=1/7
work done by 10 women in one day=1/14
thus, work done by 5 men in a day=1/(7x2)  =1/14
adding both, we get the answer:
work done by 5 men and 10 women in a day=1/14 +1/14
                                                                       =1/7
so,time taken = 7 days
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