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You are reading the website of the 2018 edition of the MathsBombe, which ended on Saturday 28th April at 11:59 pm
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Puzzle 5.

You pay for a 40p chocolate bar using a 1 pound coin. What is the minimum possible volume that could be occupied by your change?

You should base the calculation on the geometric data provided by the Royal Mint and neglect any surface details such as patterns and milling. You may assume that all coins were minted after the year 2000.

Please enter you answer in cubic millimetres to 4 significant figures.

Your answer:
No answers can currently be submitted as the competition is closed.
MathsBombe 2017 is organised by the The School of Mathematics at the University of Manchester.
Contact us via mathsbombe@manchester.ac.uk with any queries.