document.write( "Question 663956: David has scored 81, 89, 94, and 81 on his previous four tests. What score does he need on his next test so that his average (mean) is 81 ? \n" ); document.write( "

Algebra.Com's Answer #413475 by ReadingBoosters(3246) $\"\"$ $\"About$

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\n" ); document.write( " $\"%2881%2B89%2B94%2B81%2Bx%29%2F5+=+81\"$
\n" ); document.write( "Combine like terms
\n" ); document.write( " $\"%28345+%2B+x%29%2F5+=+81\"$
\n" ); document.write( "Multiply both sides by 5
\n" ); document.write( "345+x = 405
\n" ); document.write( "Group like terms
\n" ); document.write( "x = 405 - 345 = 60
\n" ); document.write( "x=60 is the next score for an average of 81
\n" ); document.write( "........................
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