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A STUDENT HAS SCORED 84, 78 AND 86 ON THREE 100 -POINT EXAMINATIONS FOR MATH CLASS. HOW MANY POINTS DOES THE STUDENT NEED TO SCORE ON THE 200-POINT FINAL EXAM, IN ORDER TO GET AN AVERAGE OF 90%, WHICH IS AN A, IN THE COURSE?
1 answer
90 = (84 + 78 + 86 + x/2 + x/2) / 5
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