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

English

Gujarati

Hindi

4.Average

medium

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

Share

Similar Questions

The $average$ of $30$ numbers is $12 .$ The $average$ of the first $20$ of them is $11$ and that of the next $9$ is $10 .$ The last number is

medium

The average of $25$ results is $20 .$ the average of first $12$ results is $15$ and that of the last $12$ results is $18 .$ Then, the $13^{ th}$ results is

medium

The average age of three boys is $15$ $year.$ If the ratio of their ages is $3:5: 7,$ what is the age of the oldest boy in $year$?

medium

The average age of $8$ men is increased by $2\, years.$ When $2$ of them, whose ages are $20\, years$ and $24 \,years$ respectively, are replaced by $2$ women. What is the average age of these two women ? (in $years$)

medium

A man travels by a car to his office at $60 \,km / h$ and returns home along the same route at $20 \,km / h .$ Find the average speed of his whole journey. (in $km/h$)

medium