The average age of Kishore rsquo s family consisting of 5 members 3years ago was 31years One year ag...........

Quantitative Aptitude (CCS) Average

The average age of Kishore’s family consisting of 5 members 3years ago was 31years. One year ago a new born baby was born in this family. Three years hence the average age of the family will be.

31 1/2

31 5/6

32 1/4

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Explanation:

Solution:
3yrs ago total age of 5members 5*31=155
At the time of birth of new born baby the total age of family 155+ (2*5)=165.
The present total age of family 165+ (1*6) =171
Then 3 years hence, the average age of the family =171+ (6*3)/6
=171+18/6==>189/6=31 1/2 .