A man walks 30 meters towards South. Then, turning to his right, he walks 30 meters. Then turning to his left, he walks 20 meters, again he turns to his left and walks 30 meters. How far is he from his initial position?

The speed of a car is 30km/hr. How many hours will it take to travel a distance of 135 km?

The average of three numbers is 20. If two numbers are 16 and 22, the third is: 

When the present age of father is added to the present age of the son,the total is 30.what will be their total age after 10 years? 

A bag priced Rs.80/- is sold for Rs. 68/-. The rate of discount is: 

 In a row of boys, Anil is 10th from one end and 7th from the other end. How many boys are there in the row?