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From the people behind the Alan Turing Cryptography Competition.
Applications now open for Making Maths at Manchester 2017, a two-day event for year 12 maths students.
You are reading the website of the 2017 edition of the MathsBombe, which ended on Saturday 29th April at 11:59 pm
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Puzzle 3.

A miserly billionaire stores UK coins in a giant silo to avoid paying tax. Coins are released by turning a giant crank attached to the silo, but only one coin is released for each turn of the crank. The billionaire requires 60 coins of identical value. Assuming that the silo contains an infinite supply of coins of every possible denomination in standard circulation (ignoring any special commemorative coins), how many turns of the crank are needed to guarantee this?

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.