In a test there are 5 marks for correct answers and 2 marks are lost for incorrect answers. Bob got n correct answers.
(a) In terms of n find the number of marks he gained for his correct answers.
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(b) He answered 20 questions in total. Find a formula for the number of questions he got wrong.
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(c) Find a formula for the number of marks he lost for the wrong answers.
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(d) In total he got 65 marks. Using your previous answers write down an equation in n for the number of marks he got.
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(e) By solving the equation find how many questions he got right.
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