Arithmetic Questions And Answers :: Chain Rule: part3

11.20 men complete one-third of a piece of work in 20 days. How many more men should be employed to finish the rest of the work in 25 more days ?

12.If a certain number of workmen can do a piece of work in 25 days, in what time will another set of an equal number of men do a piece of work twice as great, supposing that 2 of the first set can do as much work in an hour as 3 of the second set can do in an hour ?

13.A garrison of 500 men had provisions for 24 days. However, a reinforcement of 300 men arrived. The food will now last for :

14.If 18 pumps can raise 2170 tonnes of water in 10 days, working 7 hours a day, in how many days will 16 pumps raise 1736 tonnes, working 9 hours a day ?

15.A contractor undertook to do a certain piece of work in 9 days. He employed certain number of labouters but 6 of them being adsent from the very first day, the rest could finish the work in 15 days. The number of men originally employed were :