On the five exams in physics, Tommy earned an 80, 83, 87, 91, and 93. If all exams are weighted equally, nothing else determines his grade, and 100 is the highest he can score on an exam, what minimum score does Tommy have to get on his sixth exam to bring his mean score to 90?

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On the five exams in physics, Tommy earned an 80, 83, 87, 91, and 93. If all exams are weighted equally, nothing else determines his grade, and 100 is the highest he can score on an exam, what minimum score does Tommy have to get on his sixth exam to bring his mean score to 90?