There are 20 questions in a quiz. 5 marks are awarded for each correct answer, 2 marks are deducted for each wrong answer and 1 mark was awarded if the question was not attempted. Sophia got 67 marks altogether. How many questions did she get correct?

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assumeing that 15 correct ans...

she got 14 right
3 wrong
and skipped 3

this makes total score of 67 :D

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