63 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?
Choose the correct choice
A) 21 B) 23 C) 24 D) 25 E) 26
According to the chain rule,   M1 x T1 = M2 x T2   Therefore, 63 x 12 x 5 = 30 x 6 x X   X = 21   Hence, the number of days = 21.   21NSWER:21
<result>A</result>
63 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?