1. If 8 men can do a piece of work in 20 days, in how many days could 20 men do the same work ?

2. A boy runs 1 km in 10 minutes. How long will he take to ran 600 m ?

3. If x = 20 and y = 40, then x and y are:

4. 6 pipes are required to fill a tank in 1 hour. How long will it take if only 5 pipes of the same type are used ?

5. x and y vary inversely with each other. If x – 15 when y = 6, then the value of x when y = 15 is

6. 120 copies of a book cost Rs 600. What will 400 copies cost ?

7. 15 books weigh 6 kg. What will 6 books weigh ?

8. 8 g of sandal wood cost Rs 40. What will 10 g cost ?

9. A horse eats 18 kg of com in 12 days ? How much does he eat in 9 days ?

10. 10 metres of cloth cost Rs 1000. What will 4 metres cost ?

11. If an amount of food last for 40 days for 120 men, how long will it last for 80 men at the same rate ?

12. 20 trucks can hold 150 metric tonnes. How much will 12 trucks hold ?

13. 3 lambs finish eating turnips in 8 days. In how many days will 2 lambs finish them ?

14. If x = ky and when y = 4, x = 8 then k =

15. A shot travels 90 m in 1 second. How long will it take to go 225 m ?

16. The rent of 7 hectares is Rs 875. What is the rent of 16 hectares ?

17. 3 knives cost Rs 63. What will 17 knives cost ?

18. 40 cows can graze a field in 16 days. How many cows will graze the same field in 10 days ?

19. 10 men can dig a trench in 15 days. How long will 3 men take ?

20. If 18 women can reap a field in 7 days, in what time can 6 women reap the same field ?