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

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