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In a maths competition each correct answer gets 3 marks, but one mark is deducted for each incorrect answer. Grace answers all 30 questions that are on the test and scores 30 marks. How many questions
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In a maths competition each correct answer gets 3 marks, but one mark is deducted for each incorrect answer.

Grace answers all 30 questions that are on the test and scores 30 marks. How many questions did she get wrong?

User Kimberli
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1 Answer

7 votes
Grace got 20 questions wrong.
User Guillaume Fenollar
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7.7k points
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