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Q: What if your quiz grades are 19 17 20 and 15 What grades can you receive on the next quiz and maintain at least an 18 average Answer as an inequality?
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What if your quiz grades are 19 17 20 and 15 What grades can you receive on the next quiz and maintain at least an 18 average?

If you take one more quiz, your total number of quizzes taken will be 5. In order to have at least an 18 average over 5 quizzes, the sum total of all grades needs to be 5 x 18 = 90. The sum total of the previous 4 quizzes was 19 + 17 + 20 + 15 = 71. Therefore, you would need at least a grade of 90 - 71 = 19. The answer to the question is therefore "19 or more".


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