Question

3 men and 4 boys can do a piece of work in 14 days, while 4men and 6 boys can do it in 10 days. How long will it take 1 boy to finish the work?

Answer 1

3men + 4boys =1/8 4men +4boys =1/6 , solving the above men =1/24 it means the effort b=0 to boys is null since there are two men this 2/24 = 12days :