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anonymous
 5 years ago
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 ???????
anonymous
 5 years ago
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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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.030*0.75+120*0.9=150*0.87

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0so it is x*0.75+y*0.9=150*0.87

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0and if you solve these two equations than you get the result

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0I will key in with my scientific calculator. sounds right wait.... thank you

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0but the 30 and 120 is not given..... that is the answer at the back of my book

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0yes that is what confused me :D

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0hey he gave us a clue that brass is made of copper and zinc it means the other percentage to make a 100% is a zinc.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0but now it is clear. let x be the 75% one and y the 90% than we want to make 150 pounds so x+y=150 also we want to get 87% brass so x*0.75+y*0.9=150*0.87

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0y=150x from first equation you plug this into the second 0.75x +(150x)*0.9=150*0.87

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0this gives 4.5=0.15x so x=30 y=(150x)=120

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0I am using scientific calculator using the command matrix.... ok let me do that.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0calculators are bad... they do the work for you but you dont think

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0hehehe! yah.... but we are allowed to use it though in math modeling... i hate math ill be glad to get out in this class... its the only math i will be taking in nursing. thank goodness

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0did you get the result by the way?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0not yet im still trying to figure out how to key in figures using matrix command.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0I did not use a calculator and had the answer 10 minutes ago :)

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0thanks for your time andras I got the answer solving manually using your equation. But i donno how to key in the scientific calculator thoughthanks for your effort. love this site.
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