Question

if 36 men can do a piece of work in25 hours, in how many hours will 15 men do it

Answer 1

Let the required no of hours be x. Then

 

Less men , More hours    (Indirct Proportion)

 

Therefore,  15:36 ::25:x  

=> (15 x X)=(36 x 25)  => x = 60

 

Hence, 15 men can do it in 60 hours.