Average age of A, B, C, D five years ago was 45, years. By including x , present average age of all

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The average age of $A, B, C, D$ five years ago was $45\, years.$ By including $x$, the present average age of all the five is $49\, years.$ The present age of $x$ is (in $years$)

A

$64$

B

$48$

C

$45$

D

$40$

Solution

Present age of $x$

$=[(49 \times 5)-(4 \times 45+4 \times 5)]$ years

$=45$ years.

Standard 13

Quantitative Aptitude

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