Question
To be successful in a competition, Marlin needs 100
average scores in 4 exams. The scores of the previous three exams are 136, 106 and 76, respectively. To succeed in the competition, how much will he have to score in the fourth test?Solution
We can use this formula to solve for x: 100= (136+106 + 76 + x)/4 Multiplying both sides by 4: 400=318 + x Subtracting 222 from both sides: x = 82 Therefore, Marlin needs to score 82 in the fourth exam to achieve an average score of 100 in all four exams.
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34 : 408
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