Five years ago, average age of P and Q was 15 ,year. Now, average age of P , Q and R is 20 ,year. Wh

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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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