Quantitative Aptitude Ques 1776

Question: The average age of a family of five members is 24. If the present age of the youngest member is 8 yr, then what was the average age of the family at the time of the birth of the youngest member? [Corporation Bank (PO) 2011]

Options:

A) 20 yr

B) 16 yr

C) 12 yr

D) 18 yr

E) 21yr

Show Answer

Answer:

Correct Answer: A

Solution:

  • Average of 5 members of a family is 24.

$ \therefore $ Total age of five members of a family $ =24\times 5=120 $

$ \therefore $ Total age of four members at the time of birth of the youngest member $ =120-8\times 5 $ $ =120-40=80yr $ Hence, required average age $ =\frac{80}{4}=20yr $