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Eugene must take four exams in a geography class. If his scores on the first three exams are 92, 67, and 82, what score does

Eugene must take four exams in a geography class. If his scores on the first three exams are 92, 67, and 82, what score does he need on the fourth exam for his overall mean to be the following?

(a) at least 70

(b) at least 80

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