jaylow2 jaylow2

04-10-2016
Mathematics

contestada

an alloy of tin is 15% tin weigh 20 pounds . A second alloy is 10% tin . how much pounds of the second alloy must be added to the first to get a 12% mixture

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Stefanski Stefanski

11-10-2016

12%=(3+10%*x)/(20+x)
x=30

add 30 pounds of the second alloy

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