Question 668879
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Hi,
a metallurgist has one alloy containing 20% copper and another containing 70% copper. These can be blended to get a mixture between 20 and 70%. 
Create a model to determine how many pounds of each alloy to mix to achieve 
a given weight and copper percentage{{{highlight(P)}}}: {{{.70x+ .20y= P(x+y)}}}
calculate the mixture needed for 50lbs of 40% copper.
 {{{.70x + .20(50-x) = .40*50}}}     {{{y = (50-x)}}}
                   .50x = .20*50
                      x = 20lbs 70%  and 30lbs 20%