Mehul had a Social Studies exam which was worth 20 marks.There were 10 questions worth 2 marks each.But there was negative marking scheme such that if Mehul gets a question correct then he will get 2 marks , but if he gets it wrong , he will get -0.5 marks.If Mehul scored 75% in the test and he attempted all the questions, Find the number of questions he got correct.

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