Three maths classes: X, Y, and Z take an algebra test. The average score of class X is 83. The average score of class Y is 76. The average score of class Z is 85. The average score of class X and Y is 79 and the average score of class Y and Z is 81. What is the average score of the combined classes X, Y, and Z?
A. 81
B. 81.5
C. 82
D. 84.5
E. None of these
সঠিক উত্তরঃ
B.
81.5
Explanation:
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