SOLUTION: 5 years ago,the average age of p and q was 15 years.average age of p,q and r today is 20 years. how old will r be after 10 years?

Question 304764: 5 years ago,the average age of p and q was 15 years.average age of p,q and r today is 20 years. how old will r be after 10 years?

Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
5 years ago,the average age of p and q was 15 years.
average age of p,q and r today is 20 years.
how old will r be after 10 years?
:
"5 years ago,the average age of p and q was 15 years."
= 15
= 15
multiply by 2
p + q - 10 = 30
p + q = 30 + 10
p + q = 40
:
"average age of p,q and r today is 20 years."
= 20
Multiply by 3
p + q + r = 60
:
Subtract the 1st equation from the above equation
p + q + r = 60
p + q + 0 = 40
--------------------subtraction eliminates p & q
r = 20 age now
:
how old will r be after 10 years? r = 30
RELATED QUESTIONS
Five years ago , the average of P and Q was 15 years . Average age of P, Q, and R today... (answered by ankor@dixie-net.com)

Mrs. A has four children, namely, P, Q, R, and S. Q is currently twice the age of S.... (answered by ankor@dixie-net.com)

P years ago a man age was(q+r)times that of his son who was then r years old.how old is... (answered by greenestamps)

P years ago, a man’s age was (q+r)times that of his son who was then r years old.How... (answered by mananth)

the mean age of a and b five years ago was 15 years . mean age og a,b and c today is 20... (answered by mananth)

q's age is 80% of R's age. five years from now Q's age will be 90% of R's age. how old is (answered by CubeyThePenguin)

the average age (A) of 4 boys whose ages are m,n,p and q... (answered by jim_thompson5910)

5 years ago the sum of my age and my daughters age was a third of five times the average... (answered by JBarnum)

The average of Alex's, Bonnie's, and Carl's ages is 9. Four years ago Carl was the same... (answered by MaxLiebling)