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Mathematics 8 Online
OpenStudy (anonymous):

How much of an alloy with 30% copper must be added to 25 pounds of a second alloy which is 20% copper to create a 27% alloy?

OpenStudy (anonymous):

amount of alloy = x so \[\frac{ 0.3x+(25)(0.2) }{ 25+x }=0.27\] solve for x

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