document.write( "Question 826285: there are 180 multiple choice question in test.a candidate gets 4 marks for every correct ans and for every unattempted or wrongly answerd question one mark is deducted from total score of correct answer.it a candidate scired 450 marks in the test.how many question did he sns correctly. \n" ); document.write( "
Algebra.Com's Answer #497996 by Edwin McCravy(20063)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "let x = the number of questions answered correctly, then:\r\n" );
document.write( "180-x = the number of unattempted or wrongly answered questions.\r\n" );
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document.write( "Points earned for the x questions answered correctly = 4x\r\n" );
document.write( "Points deducted from the 180-x unattempted or wrongly\r\n" );
document.write( "      answered questions = -1(180-x).\r\n" );
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document.write( "4x - 1(180-x) = 450\r\n" );
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document.write( " 4x - 180 + x = 450\r\n" );
document.write( "   \r\n" );
document.write( "     5x - 180 = 450\r\n" );
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document.write( "           5x = 630\r\n" );
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document.write( "            x = 126\r\n" );
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document.write( "Number of questions answered correctly = 126\r\n" );
document.write( "number of unattempted or wrongly answered questions = 180-126 = 54\r\n" );
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document.write( "Checking \r\n" );
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document.write( "4×126 = 504 for 126 questions answered correctly\r\n" );
document.write( "-1×54 = -54 for 54 unattempted or wrongly answered questions\r\n" );
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document.write( "       450 = his score  (that checks!)\r\n" );
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document.write( "Edwin
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