If 6 men build a house in a week, how many men will be required to build the house in 2 days?
72 men can build a small house in 30 days, working 8 hours a day. In how many days will 80 men, working 6 hours a day, complete the work?
15 men can build a wall in 60 days. How many more men are required to build another wall of same size in 45 days?