Brass is made from a mixture of copper and other elements. A mixture that is 80% copper is combined with a mixture that is 60% copper, resulting in 100 pounds of brass that is 65% copper. Which equation can be used to find x, the amount of 60% mixture used to create the 65% mixture? 0.8 (100 - x) + 0.6x = 100 (0.65) 0.6 (100 - x) + 0.8x = 100 (0.65) 0.8 (100) + 0.6x = 0.65 (100 - x) 0.6 (x) + 0.8 (100 + x) = 0.65
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