SOLUTION: how much of an alloy that is 30 copper should be mixed with 100 ounces that is 70% copper in order to get an alloy that is 50% copper

Question 818621: how much of an alloy that is 30 copper should be mixed with 100 ounces that is 70% copper in order to get an alloy that is 50% copper
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
a = weight of 30% copper allow
w = weight of final mixture
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30a + 70(100) = 50w
w = 100 + a
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30a + 7000 = 50w
30a + 7000 = 50(100 + a)
30a + 7000 = 5000 + 50a
20a = 2000
a = 100
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answer:
mix in 100 ounces of 30% copper alloy
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