document.write( "Question 251071: Mike's average on five tests are 84,80,76,96,and 80. What must mike score on his sixth test so that his average will be 85? \n" ); document.write( "
Algebra.Com's Answer #182846 by checkley77(12844)\"\" \"About 
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84,80,76,96,and 80
\n" ); document.write( "(84+80+76+96+80+X)/6=85
\n" ); document.write( "(416+X)/6=80 CROSS MULTIPLY.
\n" ); document.write( "416+X=480
\n" ); document.write( "X=480-416
\n" ); document.write( "X=64 IS THE REQUIRED TEST SCORE ON THE LAST TEST TO MAINTAIN AN AVERAGE OF 80.\r
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