If 12 men or 20 women can do a piece of work in 81 days, then in how many days can 9 men and 12 women together do the work?
Choose the correct choice from the following choices.
A) 10 days B) 30 days C) 20 days D) 60 days E) 40 days
D   60 days   Given that 12m = 20w =&gt; 3m = 5w   9 men + 12 women = 15 women + 12 women = 27 women   20 women can do the work in 81 days. So, 27 women can do it in   (20 * 81) /27= 
<gadget id="calculator">  (20 * 81) /27</gadget>
<output>60</output>
60 days.
<result>D</result>
If 12 men or 20 women can do a piece of work in 81 days, then in how many days can 9 men and 12 women together do the work?