Question 911345: How much pure copper must be added to 50 kg of an alloy containing 12% copper to raise the copper content to 21%? Found 2 solutions by lwsshak3, josmiceli:Answer by lwsshak3(11628) (Show Source):
You can put this solution on YOUR website! How much pure copper must be added to 50 kg of an alloy containing 12% copper to raise the copper content to 21%?
***
let x=amt of pure copper to add:
12%*50+100%x=21%(50+x)
6+x=10.5+.21x
.79x=4.5
x=5.7
amt of pure copper to add: 5.7 kg
You can put this solution on YOUR website! Let = kg of pure copper to be added kg of copper in 12% alloy
---------------------
5.696 kg of pure copper must be added
------------------
check:
OK
(