Ten years ago average age of P and Q was 20, years. Average age of P, Q and R is 30, years now. Afte

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Ten years ago the average age of $P$ and $Q$ was $20\, years.$ Average age of $P, Q$ and $R$ is $30\, years$ now. After $10 \,years,$ the age of $R$ will be (in $years$)

A

$35$

B

$40$

C

$30$

D

$45$

Solution

(b) $( P + Q )^{\prime}$ s present age $=40+20=60$ years

$(P+Q+R)$ 's present age $=90$ years

$R ^{\prime} s$ present age $=(90-60)=30$ years

$R$ 's age after $10$ years $=(30+10)=40$ years

Standard 13

Quantitative Aptitude

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