A father is 3 times as old as his son now. After 18 years the father will be only one less than double the age of the son. What is the age of the father now ? 

Geethu purchase 8 pencils and 10 pens for Rs.122. Neethu purchased 6 pencils and 8 pens for Rs.132, from the same trader, at the same rate. What is the price of one pen ? 

A person saved Rs.28,750 in 10 years. In each year after the first year, he saved Rs.150 more than he did in the proceeding year. The amount of money he saved in the first year was: 

The average age of 10 players is 18. When a new player is included in the squad, the average age became 19, what is the age of the player included ?

If 4*5 = 9 and 5*4 = 21, then 6*9 = 

The ratio between the radius and height of a cylinder of volume 502.4 cm³ in 2:5. Its height is: