Suppose that both 75% brass and 90% brass are available. How many pounds of each must be mixed to get 150 pounds of 87% brass? My book answers were x=30 pounds of 75% brass and y= 120 pounds of 90% brass. I wanted to know how to get that answer-- what is the equation is it x + y= 150 and ???????

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30*0.75+120*0.9=150*0.87

so it is x*0.75+y*0.9=150*0.87

plus x+y=150

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