document.write( "Question 297439: After taking 3 quizzes, your average is 79 out of 100. What must your average score be on the next five quizzes to increase your average to 84? \n" ); document.write( "

Algebra.Com's Answer #214195 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"x\"$ = the sum of the first 3 quiz scores
\n" ); document.write( "given:
\n" ); document.write( " $\"x%2F3+=+.79\"$
\n" ); document.write( " $\"x+=+2.37\"$
\n" ); document.write( "Let $\"y\"$ = the sum of the last 5 quiz scores
\n" ); document.write( " $\"%282.37+%2B+y%29%2F%285+%2B+3%29+=+.84\"$
\n" ); document.write( " $\"2.37+%2B+y+=+.84%2A8\"$
\n" ); document.write( " $\"y+=+6.72+-+2.37\"$
\n" ); document.write( " $\"y+=+4.35\"$
\n" ); document.write( " $\"4.35%2F5+=+.87\"$
\n" ); document.write( "The average score of the last 5 quizes is 87%
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