Please help me in solving the problem in scilab

Could anyone please help me in solving the following problem,

To control a cereal pest it is recommended to spray the cereal with a mixture of 6 units of chemical A, 10 units of chemical B and 8 units of chemical C. These ingredients are available in three pre-mixed packs: One ton of the S1 spray contains 1, 3 and 4 units of chemicals A, B and C; one ton of spray S2 contains 3 units of each chemical and one ton of spray S3 contains 2 units of A and 5 units of B. How much of each conventional spray should be used to get the exact amount of chemicals needed?

Original question is from german, the question as follows,

Eine Farm hat 3 Arten Vieh: Schafe, Ziegen und Schweine. Es gibt drei verschiedene Futtersorten: A, B und C. Jedes Schaf braucht jeden Monat 3 Einheiten vom Futter A, 7 Einheiten von B und 5 Einheiten von C. Jede Ziege braucht 4 Einheiten von A, 8 Einheiten von B und 7 Einheiten von C. Jedes Schwein verbraucht 4 Einheiten von A, 9 Einheiten von B und 6 Einheiten von C in jedem Monat. Wie viele Tiere von jeder Art kann die Farm halten, wenn jedes Monat 129 Einheiten des Futter A, 285 Einheiten von B und 210 Einheiten von C zur Verfügung stehen und alles verbraucht werden soll?

NOTE: This exercise problem is taken from the book "Übersetzung, Ergänzung und Überarbeitung des Original-MATLAB-Tutorials zu MATLAB-Version 5.3 Getting Startet With MATLAB" could you please help me in solving this problem and if you know the solutions for the other exercise problems from this book share with me kindly.
please find the attached first page of this book. If you want this book I have the pdf, I can share with you

Thank you for your help

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