Question

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. 12 years
• B. 11 years
• C. 10.5 years
• D. 10 years

Answer 1

The correct option is B 11 years

$Father+Mother=2\times 35=70years$
$Father+Mother+Son=27\times 2=81years$
$\therefore$ Son's age $=81-70=11years$