SOLUTION: how much of an alloy that is 30% copper should be mixed with 200 ounces of an alloy that is 90% copper in order to get an alloy that is 70% copper

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Question 627311: how much of an alloy that is 30% copper should be mixed with 200 ounces of an alloy that is 90% copper in order to get an alloy that is 70% copper
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

how much of an alloyhighlight%28x%29 that is 30% copper should be mixed with 200oz of an alloy that is 90% copper 

in order to get an alloy that is 70% copper

    copper + copper = copper

 .30x+%2B+.90%2A200oz+=+.70%28200%2Bx%29%0D%0A++++++++++++%7B%7B%7B.20%2A200+=+.40x

                   100oz = x



Note:  30oz + 180oz =  210oz                      

Set Up on ALL mixture problems is to have the same amount of the key ingredient on both sides of the EQ