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a goldsmith combined an alloy that costs $4.40 per ounce with an alloy that costs $1.90 per ounce. how many ounces of each were used to make a mixture of 200 oz costing $2.60 per ounce?

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$76.92 is what the answer is
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4.4x + 1.9(200-x) = 520

4.4x +  380 - 1.9x = 520

x = 56


56 ounces of the $4.40 per ounce alloy

200 - 56 = 144 ounces of the $1.90 per ounce alloy

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