Ratio of age of father, mother and son is 9:8:3. Five years hence sum of their age will be 95 years. Find the age of son 5 years ago.

There are some friends, all less than 20 years. When paired amongst themselves they realize that the sum of their ages is a multiple of 5. If their ages are distinct prime numbers, then the number of possible pairs are: 

The average age of A, B and C is 20 years, if the average age of A and B is 19 years, then what is the age of C?

Salim's age is 10 years. His grandfather's age is 62 years. After how many years will his grandfather's age be five times that of Salim?

The average age of three girls is 15 years if their ages are in the ratio 3 : 5 : 7, what will be the age of the youngest girl?

Six years ago, the ratio of the ages of Karn and Sahil was 6 : 5. Four years hence, the ratio of their ages will be 11 : 10. What is Sahil’s age at present?

The respective ratio of, the present age of a Monika and Divya is 7 : 1. Four years ago the respective ratio of their age was 19 : 1. What will be the Monika’s age four years from now?

A mother is 28 years older than twice the age of her son. Five years later, the mother will be 10 years older than thrice the age of her son. What is mother’s present age?