7. Kamla got married 6 years ago. Today her age is 1 times her age at the time of marriage. Her son�s is (1/10) times her age. Her son�s age is:

8. There years ago the average age of A and B was 18 years. With C joining them the average becomes 22 years. How old is C now?

9. The age of a father 10 years ago was thrice the age of his son. Ten years hence the father�s age wil be twice that of his son. The ratio of their present ages is: