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As last month’s puzzle was quite difficult (particularly if you did not have access to pen and paper), this month’s is a little easier. It’s the sort of puzzle that you could throw out to your pupils at the end of the lesson and is inspired by the forthcoming exam season.
Mac has taken seven maths exams this year. His average mark is 78%. What mark must he get on the eighth exam to raise his average to 80%?
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For many more mathematical puzzles visit the Transum Puzzles page.
