SOLUTION: Joana is 11 years old today. If her mother is 31 years old, how many years from now will her mother be twice as old as she?

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Question 889905: Joana is 11 years old today. If her mother is 31 years old, how many years from now will her mother be twice as old as she?
Answer by charu91(7) About Me  (Show Source):
You can put this solution on YOUR website!
Present age of Joana=11
Present age of mother=31
After some years mother's age is twice as that of joana's.Let the number of years be n
Thus, 31+n=2(11+n)
31+n=22+2n
31-22=2n-n
Therefore,n=9
Check:mother's age after 9 years
=31+9=40
Joana's age after 9 years=11+9=20
Joana's mother is twice as old as her after 9 years