# 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

#### Comments and Answers (2)

**Zoe** * *

please explain answer

**Li** * *

need help, explain answer

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