4. 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 ?

5. If 18 binders bind 900 books in 10 days, how many binders will be reguired to bind 660 books in 12 days ?

6. 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 :