In a family, the average age of a father and a mother is 35 years. The average age of the father, mother and their only son is 27 years. What is the age of the son? (a) 10 years    (b) 10.5 years    (c) 11 years    (d) 12 years

The sum of the ages of a father and his son is 4 times the age of the son. If the average age of the father and the son is 28 years, what is the son's age?

The average age of 3 children in a family is 20% of the average age of the father and the eldest child.The total age of the mother and the youngest child is 39 years.If the father's age is 26 years,what is the age of the second child? (a) 15 years ( b) 18 years ( c) 20 years (d) Cannot be determined

5 years ago the average age of a family which includes father, mother and a son was 35 years. 3 years ago the average age of father and mother was 46 years. What is the present age (in years) of the son?

At present the average of the ages of a father and a son is 25 years. After seven years the son will be 17 years old. What will be the age of the father after 10 years ?