Arithmetic Questions And Answers :: Chain Rule: part4

16.If 17 labourers can dig a ditch 26 metres long in 18 days, working 8 hours a day, how many more labourers should be engaged to dig a similar ditch 39 metres long in 6 days, each labourer working 9 hours a day ?

17.20 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 ?

18.If 300 men can do a piece of work in 16 days, how many men would do (1/5) of the work in 15 days ?

19.If six men working 8 hours a day earn Rs. 840 per week, then 9 men working 6 hours a day will earn per week :