document.write( "Question 596909: 1.  A student has earned scores of 87, 81, and 88 on the first 3 of 4 tests. If the student wants an average (arithmetic mean) of exactly 87, what score must she earn on the fourth test?
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\n" ); document.write( "C.  87
\n" ); document.write( "D.  92
\n" ); document.write( "E.  93
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Algebra.Com's Answer #377943 by jim_thompson5910(35256)\"\" \"About 
You can put this solution on YOUR website!
Let x = fourth test score\r
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\n" ); document.write( "\n" ); document.write( "(87+81+88+x)/4 = 87\r
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\n" ); document.write( "\n" ); document.write( "87+81+88+x = 87*4\r
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\n" ); document.write( "\n" ); document.write( "87+81+88+x = 348\r
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\n" ); document.write( "\n" ); document.write( "256+x = 348\r
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\n" ); document.write( "\n" ); document.write( "x = 348-256\r
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\n" ); document.write( "\n" ); document.write( "x = 92\r
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\n" ); document.write( "\n" ); document.write( "So the answer is choice D
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