4 men or 8 women can do a piece of work in 24 days. In how many days, will 12 men and 8 women do the same work?

A)6      B)8  C)5      D)None of these

Answer:6

The efficiency of men is twice that of women

8 women are equal to 4 men

So 12 men and 8 women = 16 men

4 men can do the work in 24 days

16 men need 24/4 =6 days