A certain exam has 30 questions. A student gets 1 point for each question he gets right and loses half a point for a question he answers incorrectly; he neither gains nor loses any points for a question left blank. If C is the number of questions a student gets right and B is the number of questions he leaves blank, which of the following represents his score on the exam

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A certain exam has 30 questions. A student gets 1 point for each question he gets right and loses half a point for a question he answers incorrectly; he neither gains nor loses any points for a question left blank. If C is the number of questions a student gets right and B is the number of questions he leaves blank, which of the following represents his score on the exam