Mr. Mathis' class had m boys and 11 girls. Mr. English's class had nine boys and n girls. Two classes raised the same amount of money during a charity sell, with each class raising $(mm + 9m + 11n + 145 ). It was known that every student participated in the activity and each student donated the same amount of money ( a whole dollar amount ) more than $30. How much money was donated by each student?
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