SOLUTION: A metal is made by adding copper aand zinc in the ratio of 3:11. This new metal is then taken and mixed with more zinc in the raio 2:3. how much copper would be there in 4200kg of

Algebra ->  Percentage-and-ratio-word-problems -> SOLUTION: A metal is made by adding copper aand zinc in the ratio of 3:11. This new metal is then taken and mixed with more zinc in the raio 2:3. how much copper would be there in 4200kg of       Log On


   

Question 692386: A metal is made by adding copper aand zinc in the ratio of 3:11. This new metal is then taken and mixed with more zinc in the raio 2:3. how much copper would be there in 4200kg of the final metal?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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A metal is made by adding copper and zinc in the ratio of 3:11.
This new metal is then taken and mixed with more zinc in the ratio 2:3.
how much copper would be there in 4200kg of the final metal?
:
Find what fraction is zinc in the first metal:
11%2F%28%283%2B11%29%29 = 11%2F14
:
Mixed with more zinc 2:3 = 3%2F5 is zinc
then
11%2F14 * 3%2F5 = 33%2F70 is now zinc
then
70%2F70 - 33%2F70 = 37%2F70 is now copper
:
37%2F70*4200 = 2220 kg is copper