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4.Average
easy
The average age of $6$ members of a family is $20\, years.$ If the age of a servant is included, the average age increased by $25 \%$. What is the age (in $years$) of the servant ?
A
$30$
B
$35$
C
$50$
D
$55$
Solution
$25 \%(20)=5$
Age of Servant $\Rightarrow \frac{6 \times 20+S}{7}=25$
$120+ S =175$
$S=55$
Standard 13
Quantitative Aptitude
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