6 years ago, the average age of Pawan and Ravi was 30. The average age of Pawan, Ravi and Ranjan ia 30. What will be the age of Ranjan after 6 years?

15 years ago, Kanika's father was five times as old as Kanika. After 15 years, her father will be thrice as old as her. What is the present age of Kanika?

The sum of the ages of A and B is 63 years. After 6 years, the age of B will be four times that of the A. What is the age of B ?