In a family, average age of a father and a mother is 35, years. average age of father, mother and th

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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 ? (in $years$)

A

$12$

B

$11$

C

$10.5$

D

$10$

Solution

$\text { Age of the son }=3 \times 27-2 \times 35 =81-70=11 \text { years }$

Standard 13

Quantitative Aptitude

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