6 boys can complete a piece of work in 16 h. In how many hours will 8 boys complete the same work?
Answer: (3) 12 hr
Given = M1 = 6, H1 = 16, M2 = 8 & H2 = ?
M1 H1 = M2 H2
Where, M = number of men & H = number of hours.
Then, 6 x 16 = 8 x H2
H2 = 96/8
H2 = 12
Hence, 8 boys complete the same work in 12 hr.