Arithmetic Questions And Answers :: Chain Rule: part4

11.If 4 examiners can examine a certain number of answer books in 8 days by working 5 hours a day; for how many hours a day would 2 examiners have to work in order to examine twice the number of answer books in 20 days ?

12.If 20 men can build a wall 112 metres long in 6 days, what length of a similar wall can be built by 25 men in 3 days ?

13.In a hospital there is a consumption of 1350 litres of milk for 70 patients for 30 days. How many patients will consume 1710 litres of milk in 28 days ?

14.If 5 men working 6 hours a day can reap 3 field in 20 days, in how many days will 15 men reap the field, working 8 hours a day ?

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