CAT Quantitative Ability Questions | CAT Averages, Ratio & Proportion questions
CAT/2001
Question . 78
Three maths 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?
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