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 \[=75-56=19yr\] |
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