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The average score of the last 3 quizzes of Sofia was 83. The overall average of her quizzes was 86. What was her average score for the first 3 quizzes?

There were total of 6 quizzes. Divide the quizzes to 3; the first 3 quizzes and the last 3 quizzes. 6 ÷ 3 = 2 averages

x = average for the first three quizzes 83 = average for the last three quizzes 86 - overall average for the 2 sets of quizzes (first 3 quizzes and last three quizzes)