Splitting Eighty-One

Divide 81 into two parts so that one may be a multiple of 8 and the other of 5.

~8 minAnswer checked instantlyDiophantine equations

H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. X. Miscellaneous Equations, Examples X.d, No. 15

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