#974 · Algebra · Systems

Composition of Brass and Bronze

Brass is an alloy of copper and zinc; bronze is an alloy containing $80%$ of copper, $4%$ of zinc, and $16%$ of tin. A fused mass of brass and bronze is found to contain $74%$ of copper, $16%$ of zinc, and $10%$ of tin: find the ratio of copper to zinc in the composition of brass, expressed as the ratio of their masses when combining brass and bronze.

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H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. II. Proportion, Examples II, No. 25

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