If 12 men or 20 women can do a piece of work in 54 days, then in how many days can 9 men and 39 women together do the work? Pick one.
A) 10 days	B) 30 days	C) 20 days	D) 80 days	E) 40 days
C   20 days   Given that 12m = 20w =&gt; 3m = 5w   9 men + 39 women = 15 women + 39 women = 54 women   20 women can do the work in 54 days. So, 54 women can do it in   (20 * 54) /54= 
<gadget id="calculator">  (20 * 54) /54</gadget>
<output>20</output>
20 days.
<result>C</result>
If 12 men or 20 women can do a piece of work in 54 days, then in how many days can 9 men and 39 women together do the work?