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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.

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?

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.

Contact us via mathsbombe@manchester.ac.uk with any queries.