document.write( "Question 1145375: Suppose your average, after taking 5 quizzes, is 74 (out of 100). What must your average be on the next 4 quizzes to increase your average to 86 out of 100? \n" ); document.write( "
Algebra.Com's Answer #766595 by richwmiller(17219)\"\" \"About 
You can put this solution on YOUR website!
(5*74+4x)/9 =86
\n" ); document.write( "370+4x=9*86
\n" ); document.write( "370+4x=774
\n" ); document.write( "4x=774-370
\n" ); document.write( "4x=404
\n" ); document.write( "x=101
\n" ); document.write( "check
\n" ); document.write( "(370+404)/9
\n" ); document.write( "774/9=86
\n" ); document.write( "So you need an average of 101 on the next four quizzes.
\n" ); document.write( "Good luck with that\r
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