SOLUTION: An alloy weighing 20 lbs is 30% copper. How many pounds of another alloy, which is 80% copper must be added for the final alloy t be 60% copper. could you please help me with th

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Question 121444: An alloy weighing 20 lbs is 30% copper. How many pounds of another alloy, which is 80% copper must be added for the final alloy t be 60% copper.
could you please help me with the set up of the equation for this problem to help me solve it.
thank you
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
An alloy weighing 20 lbs is 30% copper. How many pounds of another alloy, which is 80% copper must be added for the final alloy t be 60% copper.
:
Let x = amt of 80% copper alloy must be added:
:
The equation:
.30(20) + .80(x) = .60(x+20)