8 men can dig a pit in 20 days. If a man works half as much again as a boy, then 4 men and 9 boys can dig a similar pit in:__________?
Q1. 8 men can dig a pit in 20 days. If a man works half as much again as a boy, then 4 men and 9 boys can dig a similar pit in:__________?
Answer: 16 days
Explanation: Since 1 man = 1.5 boys, 4 men + 9 boys = 6 + 9 = 15 boy-equivalents = 10 man-equivalents; total work = 8×20 = 160 man-days, so time = 160/10 = 16 days.