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Mathematics 8 Online
OpenStudy (anonymous):

A 220-year old oak tree produced acorns at two different rates. Until it reached maturity, it produced an average of 900 acorns a year. Once it reached maturity, it produced an average of 2200 acorns a year. Angel Oak has produced about 289,000 acorns in its lifetime. At what age did it reach maturity?

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