In a family, the average age of father and mother is 35 yr. The average age of the father, mother and their only son is 27 yr. What is the age of the son?

A) 12 yr

B) 11 yr

C) 10.5 yr

D) 10 yr

Correct answer:
B) 11 yr

Description for Correct answer:
Total age of father and mother = 35 x 2 = 70 yr

and total age of father, mother and son
= > 27 x 3 = 81 yr

Age of son = 81 - 70 = 11 yr

Please provide the error details in above question

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