Answer with Explanation:
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 }
Therefore,30 x 6 x x = 39 x 5 x 12
=> x = (39 x 5 x 12)/(30 x 6)
=> x = 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 }
Therefore,30 x 6 x x = 39 x 5 x 12
=> x = (39 x 5 x 12)/(30 x 6)
=> x = 13.