SAT Math: Solving Multiple Equations to Find Jewelry Options

Elizabeth, a jeweler, makes two types of rings. One type of ring, the Goldenrod, is made from 2 grams of platinum and 6 grams of gold. Another ring, the Oracle, is made from 8 grams of platinum and 1 gram of gold. Her supply shipment for the next week has 80 grams of platinum and 79 grams of gold. If she uses all of her supplies to make a total of 19 rings, how many of those rings would be Oracles?

Heart of AlgebraSystems of linear equations in two variables (word problems)
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SAT MathAlgebra and Functions
Heart of Algebra
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