document.write( "Question 864259: Three math classes x , y and z take an exam.\r
\n" ); document.write( "\n" ); document.write( "i. the average of the classes x, y, and z are 83, 76 and 85, respectively.\r
\n" ); document.write( "\n" ); document.write( "ii. the average of classes x and y TOGETHER is 79.\r
\n" ); document.write( "\n" ); document.write( "iii. the average of classes y and z TOGETHER is 81.\r
\n" ); document.write( "\n" ); document.write( "Find the average score for the students of all 3 classes COMBINED.
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Algebra.Com's Answer #520873 by richwmiller(17219)\"\" \"About 
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