Sixty ounces of a 40% gold alloy are mixed with 40 oz of a 20% gold alloy. Find the percent concentration of the resulting gold alloy.
Let X be the new concentration,
30*40 + 20*60 = X(100)
1200 + 1200 = X(100)
2400 = X(100)
X = 2400/100
X = 24 %
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