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? Choose the correct choice from the following choices: A) 60.3 B) 70.3 C) 81.3 D) 85.3 E) 94.3
X = 83   Y =76   Z =85   so to find the average of x,y,z   (x+y+z)/3=244/3   ans is 81.33   ANSWRE:81.3
<result>C</result>
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?