A road may be repaired in 12 days by 39 people working 5 hours each day. How many days would it take 30 people working 6 hours each day to do the job?
A. 10
B. 13
C. 14
D. 15
Answer:B
A road may be repaired in 12 days by 39 people working 5 hours each day. How many days would it take 30 people working 6 hours each day to do the job?
A. 10 B. 13 C. 14 D. 15
Explanation: Let x be the number of days necessary.Fewer people, more days (Indirect Proportion)The number of working hours each day is increasing, while the number of days is decreasing (Indirect Proportion),30 : 39 : 12 : x Working hours/day Persons 30 : 39 : 12 : x Working hours/day,30 x 6 x x = 39 x 5 x 12 x 6 , x= (39 x 5 x 12)/(39 (30 x 6),x equals 1.