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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?

Correct Answer: 13

Explanation:

Let the required number of days be x.


Less persons, More days (Indirect Proportion)


More working hours per day, Less days (Indirect Proportion)


P e r s o n s 30 : 39 W o r k i n g   h o u r s / d a y 6 : 5   12 : x


 


=> 30 * 6 * x = 39 * 5 * 12 


 


=> x= 13


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