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4.Average
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Five years ago, the average age of $P$ and $Q$ was $15 \,year.$ Now, average age of $P , Q$ and $R$ is $20 \,year.$ What whould be the age of $R$ after $10$ $year$ in $year$ ?
A
$35$
B
$40$
C
$30$
D
$50$
Solution
Total present age of Pand $Q =15 \times 2+10=40 years$
Total present age of $P , Q$ and $R$.
$=20 \times 3=60$ years. $P+Q+R=60$
(Present age) $R =20$ years.
$R$ age after $10$ $years$ $=20+10=30$ $years.$
Standard 13
Quantitative Aptitude
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