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Mike needs at least a 75% average to pass his math course. The class contains 5 exams that are equally weighted. If he scored a 64%, 86%, 71%, and a 90% on the first 4 exams, what score does he need on the final exam to earn at least a 75% in the class?

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He needs 0.75 * 500 = 375 points

He has a total of 311 points.

375 - 311 = ?

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