The Intermediate Maths Challenge has 25 questions with the following scoring rules: 5 marks for each correct answer to Questions 1–15; 6 marks for each correct answer to Questions 16–25; each incorrect answer to Questions 16–20 loses 1 mark; each incorrect answer to Questions 21–25 loses 2 marks; unanswered questions score 0.
Fiona scored 80 marks in total.
What possible numbers of correct answers could Fiona have?
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Cayley Mathematical Olympiad (2024)
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