If 8 men or 12 women can do a piece of work in 25 days, in how many days can the same work be done by 6 men and 11 women?  Choose the correct choice:
A) 10 days
B) 11 days
C) 13 days
D) 15 days
E) 17 days

Rationale: "8 men = 12 women ( i . e 2 men = 3 women ) 12 women 1 day work = 1 / 25 soln : 6 men ( 9 women ) + 11 women = 20 women = ? 1 women 1 day work = 12 * 25 = 1 / 300 so , 20 women work = 20 / 300 = 1 / 15 ans : 15 days answer : d"
Answer: D