Purchasing Three Types of Animals

I buy 40 animals consisting of rams at £4, pigs at £2, and oxen at £17: if I spend £301, how many of each do I buy?

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H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. X. Miscellaneous Equations, Examples X.d, No. 20

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