five years ago the average age of q was 15 a..., Average, General Mathematics

Question:Five years ago, The average age of Q was `15` years. A average age of P,Q and R today is `20` years. How old will R be after `10` years ?

A `35 years` 
B `40 years` 
C `30 years` 
D `50 years`

/54

+ AnswerC

+ Explanation(P + Q),five years ago

`= (15 xx 2)`

`= 30 years`

(P + Q), now

`= (30 + xx 2) years`

`= 40 years`

(P + Q + R),now

`= (20 xx 3) years`

`= 60 years`

:. R now

`= (60 - 40) years`

`= 20 years`

R, after `10` years 

`= (20 + 10) years`

`= 30 years`

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