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Three math classes: X, Y, and Z, take an algebra test. The average score in class X is 83. The average score in class Y is 76. The average score in class Z is 85. The average score of all students in classes X and Y together is 79. The average score of all students in classes Y and Z together is 81. What is the average score for all the three classes, taken together? | |
A. | 81 [Wrong Answer] |
B. | 81.5 [Correct Answer] |
C. | 82 [Wrong Answer] |
D. | 84.5 [Wrong Answer] |