After taking the 3rd quiz, the average score of a student dropped from 82 to 78. What was the score of his last quiz?

After taking the 3rd quiz, the average score of a student dropped from 82 to 78. What was the score of his last quiz? Correct Answer 70

Total score of the first two quizzes = 82 x 2 = 164 Total score of the three quizzes = 78 x 3 = 234 Score of the last quiz = 234 - 164 = 70.
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