document.write( "Question 311486: The average (arithmetic mean) of 80, 83, 89, and x is the same as the average of 80, 83, and 86. What is the average of 82 and x?\r
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document.write( "(A)80 (B) 81 (C) 82 (D) 83 (E) 84
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Algebra.Com's Answer #222849 by ankor@dixie-net.com(22740)![]() ![]() You can put this solution on YOUR website! The average (arithmetic mean) of 80, 83, 89, and x is the same as the average of 80, 83, and 86. \n" ); document.write( ": \n" ); document.write( " \n" ); document.write( ": \n" ); document.write( " \n" ); document.write( "Cross multiply \n" ); document.write( "3(252+x) = 4(249) \n" ); document.write( ": \n" ); document.write( "756 + 3x = 996 \n" ); document.write( ": \n" ); document.write( "3x = 996 - 756 \n" ); document.write( ": \n" ); document.write( "3x = 240 \n" ); document.write( "x = \n" ); document.write( "x = 80 \n" ); document.write( ": \n" ); document.write( "What is the average of 82 and x? \n" ); document.write( " |