The average present age of four members of a family is 27 years and average increases by 3 years when one of their relatives joins them. The age of the relative is:
Answer & explanation
Correct answer: option 2
ATQ,
Sum of present age of family ⇒ 27×4 = 108
average age when relative joins = 30
sum of ages when relative joins ⇒ 30×5 = 150
∴ age of relative = 150-108 = 42