Question by Summer Clouds - Discuss with MathYouLike

Summer Clouds moderators

15/11/2017 at 08:40

� Marco’s average score for all 14 quizzes this semester was 81. If Marco had an average score of 75 for his first 10 quizzes this semester, what was the average score for his last 4 quizzes?

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Nguyễn Trần Hoàng Anh 15/11/2017 at 11:39

The sum of the scores of 14 quizzes is : 81 x 14 = 1134

The sum of the scores of first 10 quizzes is : 75 x 10 = 750

The sum of the scores of last 4 quizzes is : 1134 - 750 = 384

The answer is : 384 : 4 = 96
Phan Thanh Tinh Coordinator 15/11/2017 at 10:33

The sum of the scores of 14 quizzes is : 81 x 14 = 1134

The sum of the scores of first 10 quizzes is : 75 x 10 = 750

The sum of the scores of last 4 quizzes is : 1134 - 750 = 384

The answer is : 384 : 4 = 96

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