Paying with Guineas and Half-Crowns

What is the simplest way for a person who has only guineas to pay 10s. 6d. to another who has only half-crowns?

~10 minAnswer checked instantlyDiophantine equationsCurrency

H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. X. Miscellaneous Equations, Examples X.d, No. 16

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Checked against the answer in H. S. Hall & S. R. Knight, Higher Algebra (1891).