Question

Five Man each working 9 hours a day can finish a work in 30 days how many men are required to finish 8 times the work in 25 days each working 8 hours a day?​

Answer 1

Let the number of men required = m

Using the concept of variations, we have :

m = 6 x 30/25 x 9/8 x 10/1

m = 81 men.