Question
Kimberly was 9 years old and her mother was 31 years old last year. In how many years' time will Kimberly's mother be 3 times as old as Kimberly?
4 m

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Kimberly was 9 years old and her mother was 31 years old last year. In how many years' time will Kimberly's mother be 3 times as old as Kimberly?