quantitative aptitude test 104

Test # 104
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1. 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 sudents 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 clalsses?

Quantitative Aptitude
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drop around
to come for a visit
My friend plans to drop around for a visit tomorrow.
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