Question
Shiyun was 9 years old and her father was 35 years old last year. In how many years' time will Shiyun's father be 3 times as old as Shiyun?
4 m

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Shiyun was 9 years old and her father was 35 years old last year. In how many years' time will Shiyun's father be 3 times as old as Shiyun?