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 student classes Y and Z together is 81. What is the average for all the three classes?

A 81
B 81.5
C 82
D 84.5

Correct Answer: 81.5

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Related Questions

Three maths classes: X, Y, and Z take an algebra test. The average score of class X is 83. The average score of class Y is 76. The average score of class Z is 85. The average score of class X and Y is 79 and the average score of class Y and Z is 81. What is the average score of the combined classes X, Y, and Z?
A 81
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যদি দুটি সংখ্যার অনুপাত ৮ঃ৫ হয়, তবে নীচের কোন সংখ্যাটি ঐ দুটি সংখ্যার যোগফল হতে পারবে না?
A 52
B 105
C 143
D কোনোটিই নয়

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