39 persons can repair a road in 12 days, working 5 hours a day. In how many days will 30 persons, working 6 hours a day, complete the work? Options:
A) 10  B) 15  C) 12  D) 14  E) 13
Let the required number of days be x.   Less persons, More days (Indirect Proportion)   More working hours per day, Less days (Indirect Proportion)   Persons	30:39 :: 12 : x   Working hours/day	6:5   :. 30 x 6 * x = 39 * 5 * 12   x =	(39 * 5 * 12)/(30 * 6)= 
<gadget id="calculator">(39 * 5 * 12)/(30 * 6)</gadget>
<output>13</output>
13.   Answer is 13
<result>E</result>
39 persons can repair a road in 12 days, working 5 hours a day. In how many days will 30 persons, working 6 hours a day, complete the work?