document.write( "Question 344841: Sean has taken three exams and earned scores of 77, 72, and 85 out of a possible 100 points. He needs an average of at least 80 to earn a B in the class. What range of scores on the fourth (and last) 100 point test will guarantee a B in the class. \n" ); document.write( "

Algebra.Com's Answer #246741 by checkley77(12844) $\"\"$ $\"About$

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(77+72+85+x)/4=80
\n" ); document.write( "(234+x)/4=80
\n" ); document.write( "234+x=4*80
\n" ); document.write( "234x=320
\n" ); document.write( "x=320-234
\n" ); document.write( "x=86 is the lowest score for a B.
\n" ); document.write( "(77+72+85+100)/4=x
\n" ); document.write( "334/4=x
\n" ); document.write( "334=4x
\n" ); document.write( "334/4=x
\n" ); document.write( "83.5=x
\n" ); document.write( "The max score of 100 gives an average of 83.5.
\n" ); document.write( "Range is 86 to 100.
\n" ); document.write( " \n" ); document.write( "

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