29 persons can repair a road in 16 days, working 5 hours a day. In how many days will 30 persons, working 6 hours a day, complete the work? Choose the correct answer
A) 12.88
B) 3.88
C) 13.88
D) 15
E) 18.8
Let the required number of days be x   More persons, less days (indirect proportion)   More hours, less days (indirect proportion)   Hence we can write as   (persons)29:30   }::x:16   (hours)5:6   29*5*16=30*6*x   x=12.88   12.88NSWER:12.88
<result>A</result>
29 persons can repair a road in 16 days, working 5 hours a day. In how many days will 30 persons, working 6 hours a day, complete the work?