document.write( "Question 359671: You have a mean score of 84 after taking five 100-point tests. What do you need to score on the sixth 100-point test to have a mean score of 85?\r
\n" ); document.write( "\n" ); document.write( "I tried: 84+x/2=85
\n" ); document.write( "2(84+x/2)=(85)(2)
\n" ); document.write( "84-84+x=170-84
\n" ); document.write( "x=86\r
\n" ); document.write( "\n" ); document.write( "The problem is that I have multiple choice answers and 86 is not one of the answers (the answers are: A. 85 B. 89 C. 90 D. 92 \n" ); document.write( "

Algebra.Com's Answer #256674 by ewatrrr(24785) $\"\"$ $\"About$

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document.write( "Hi,
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document.write( "Let x represent the score on the sixth test
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document.write( "Mean = sum of scores/number of tests
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document.write( "84 = S/5 test   Therfore 5*84 = 420 is the sum of the first five tests
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document.write( "(420 + x)/6 = 85
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document.write( "420 + x = 510
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document.write( "x = 90 \n" );
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