document.write( "Question 1176374: Hi
\n" ); document.write( "Evan and his 3 friends scored an average of 80 marks. If Evan had scored 99 marks their average score would be 86 marks. How many marks did Evan score.
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Algebra.Com's Answer #803131 by ikleyn(52835) $\"\"$ $\"About$

You can put this solution on YOUR website!
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document.write( "Let E = Evan' scores\r\n" );
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document.write( "    R = the sum of scores of the 3 his friends.\r\n" );
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document.write( "Then you have this equation\r\n" );
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document.write( "     = 80,   or   E + R = 320     (1)\r\n" );
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document.write( "and this equation\r\n" );
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document.write( "     = 86,   or  99 + R = 344    (2).\r\n" );
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document.write( "Subtract equation (1) from equation (2)\r\n" );
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document.write( "    99 - E = 24\r\n" );
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document.write( "    99 - 24 = E\r\n" );
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document.write( "     E      = 75.      ANSWER\r\n" );
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