C -.5(30-C-B) = score.
AN INTERESTNG ALGEBRA QUESTION
A certain exam has 30 questions. A student gets one point for each question she gets right and looses half a point for a question she answers incorrectly; she neither gains nor loses a point for a question left blank. If C is the number of questions she get correct and B is the number of questions she leaves blank, write an algebraic expression representing her score.
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