Hi,

how much of an alloy 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

 

                   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 

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