document.write( "Question 762898: Suppose your average, after taking 4 quizzes, is 72 (out of 100). What must your average be on the next 5 quizzes to increase your average to 77 out of 100? \n" ); document.write( "
Algebra.Com's Answer #464313 by tommyt3rd(5050)\"\" \"About 
You can put this solution on YOUR website!
This is a weighted average:\r
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\n" ); document.write( "\n" ); document.write( "\"%0D%0A%284%2F9%29%2A72%2B%285%2F9%29%2Ax=77%0D%0A\"\r
\n" ); document.write( "\n" ); document.write( "so that x=81\r
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\n" ); document.write( "\n" ); document.write( ":)
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