document.write( "Question 992312: After five exams, Andrew has a mean mark of 70.
\n" ); document.write( "What mark must he get in the next exam to raise
\n" ); document.write( "his average to 72?
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Algebra.Com's Answer #611929 by ankor@dixie-net.com(22740)\"\" \"About 
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After five exams, Andrew has a mean mark of 70.
\n" ); document.write( "What mark must he get in the next exam to raise his average to 72?
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\n" ); document.write( "let x = the mark of the 6th exam\r
\n" ); document.write( "\n" ); document.write( "\"%285%2870%29%2Bx%29%2F6\" = 72
\n" ); document.write( "\"%28350%2Bx%29%2F6\" = 72
\n" ); document.write( "multiply both sides by 6
\n" ); document.write( "350 + x = 6(72)
\n" ); document.write( "subtract 350 from both sides
\n" ); document.write( "x = 432 - 350
\n" ); document.write( "x = 82 is the grade must get to raise his average to 72
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