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Puzzle of the Day

These puzzles are also printed in Eight days a week, a booklet published by the Association of Teachers of Mathematics.The Association of Teachers of Mathematics

I bought 2 pencils at 12p each and 5 pens at 24p each. I also bought 7 identical notebooks. I was told the total was £5. Why couldn't that be right?

Answer: Notebooks couldn't be the same price in a whole number of pence

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