document.write( "Question 1135003: Charles took a maths exam with 20 questions. For every correct question, Charles received 10 marks. For every incorrect or unanswered question,he lost 5 marks. If his final score was 140 marks, how many questions were answered correctly \n" ); document.write( "

Algebra.Com's Answer #752516 by ikleyn(52814) $\"\"$ $\"About$

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document.write( "Let x = how many questions were answered correctly.\r\n" );
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document.write( "Then the number of questions answered incorrectly is (20-x).\r\n" );
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document.write( "Charles earned 10x marks and lost 5*(20-x) marks.\r\n" );
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document.write( "His balance is\r\n" );
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document.write( "    10x - 5*(20-x) = 140.\r\n" );
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document.write( "Solve it and find the answer to your question.\r\n" );
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