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prealgebra senior

Problem

Ms. Blackwell gives an exam to two classes. The mean of the scores of the students in the morning class is , and the afternoon class's mean score is . The ratio of the number of students in the morning class to the number of students in the afternoon class is . What is the mean of the scores of all the students?
(A)
(B)
(C)
(D)
Solution
Let there be students in the morning class and students in the afternoon class. The total number of students is . The average is . Therefore, the answer is .
Final answer
C