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 for all the three classes?81 81.5 82 84.5
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Step-by-step explanation:
83+76+85/3
we should divide by 3 because 3 classes are there x y z
=244/3
81.3333.......
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