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Math percentages; Please help

Mathematics
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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.

Mar 19th, 2015

Let X be the new concentration,

30*40 + 20*60 = X(100)

1200 + 1200 = X(100)

2400 = X(100)

X = 2400/100

X = 24 %

Mar 19th, 2015

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Mar 19th, 2015
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Mar 19th, 2015
Dec 10th, 2016
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