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4.Average
easy
The average age of $30$ women decreases by $3$ $months$ if a new person Neha is included in place of a $25\, year$ old woman. Calculate the age of Neha in $year$ ?
A
$17.5$
B
$20$
C
$30$
D
$22$
Solution
Average decreases by $3$ months or $\frac{3}{12}$ years
Sum of the age decreased $=30 \times \frac{3}{12}=\frac{15}{2}=7.5$ years
Age of Neha $=25-7.5=17.5$
Standard 13
Quantitative Aptitude