There are 100 questions in a question paper, each carrying 2 marks. But there is a negative marking. 1mark is deducted for each question answered incorrectly. A student answering all the questions got 80 marks. The number of questions correctly answered by him is-

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There are 100 questions in a question paper, each carrying 2 marks. But there is a negative marking. 1mark is deducted for each question answered incorrectly. A student answering all the questions got 80 marks. The number of questions correctly answered by him is-