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A generalisation of the postage stamps problem
Published online by Cambridge University Press: 01 August 2016
Extract
In his recent note “On buying postage stamps” in the June 1987 Gazette, John Gilder discusses the solution in integers of the equation
12x + 17y =100z,
where x is the number of second class stamps (at the old rate of 12p), y the number of first class stamps (at 17p), and z the total cost in pounds. A simple algorithm, which can also be applied to equations involving three or more independent variables, is obtained from the following result.
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- Copyright © The Mathematical Association 1989