A piece of work can be done by 6 men and 5 women in 6 days or 3 men and 4 women in 10 days. It
can be done by 9 men and 15 women in how many days ?
Choose the most appropriate option
A) 3 days  B) 4 days  C) 5 days  D) 6 days  E) None of these
Explanation:   To calculate the answer we need to get 1 man per day work and 1 woman per day work.   Let 1 man 1 day work =x   and 1 woman 1 days work = y.   =&gt; 6x+5y = 1/6   and 3x+4y = 1/10   On solving, we get x = 1/54 and y = 1/90   (9 men + 15 women)'s 1 days work =   (9/54) + (15/90) = 1/3   9 men and 15 women will finish the work in 3 days   3 daysnswer: 3 days
<result>A</result>
A piece of work can be done by 6 men and 5 women in 6 days or 3 men and 4 women in 10 days. It
can be done by 9 men and 15 women in how many days ?