Banking Reasoning Sample Paper Reasoning Sample Paper-1

The average age of four boys five years ago was 9 yr. On including a new boy, the present average age of all the five becomes 15 yr. The resent age of the new boy is

A) 14 yr

B) 6 yr

C) 15 yr

D) 19 yr

Correct Answer: D

Solution :

Given, the average age of four boys five years ago = 9yr

\[\therefore \]Total age of four boys five years ago \[=9\times 4=36\,\,yr\]

Their present age \[=36+5\times 4=56\,\,yr\] and average age of five boys =15 yr

\[\therefore \]Total age of five boys \[=15\times 5=75\,yr\]

\[\therefore \]Present age of new boy \[=75-56=19yr\]