Posted by **sakena** on Monday, February 20, 2012 at 4:11pm.

Anne and Nancy use a metal alloy that is 23.5% copper to make jewelry. How many ounces of a

21% alloy must be mixed with a 30% alloy to form 108 ounces of the desired alloy?

- math -
**Steve**, Monday, February 20, 2012 at 7:00pm
you want the final 108 oz to be 23.5% copper. That means it contains 25.38 oz of copper

So, if there are x oz of 21% alloy,

.21x + .30(108-x) = .235(108)

.21x + 32.4 - .30x = 25.38

.09x = 7.02

x = 78

so, she uses 78 oz of 21% and 30 oz of 30%

## Answer this Question

## Related Questions

- math please help!! - Solve the problem. Anne and Nancy use a metal alloy that is...
- College Pre Calculus - anne and nancy use a metal alloy that is 19.3% copper to ...
- algebra - Solve the problem. Anne and Nancy use a metal alloy that is 24.9% ...
- algebra - How many ounces of a 19% copper alloy metal must be added to 42% ...
- Algebra - solve linear equation-an alloy of metal is 25% copper. Another alloy ...
- Algebra/Math - Can you show work por favor? :) A metalworker has a metal alloy ...
- math - An alloy of metals is 25% copper. Another alloy is 50% copper. How much ...
- 8th grade - An alloy of metals is 25% copper .Another alloy is 50% copper. How ...
- math - An alloy of copper is 10% copper and weighs 25 pounds. A second alloy is ...
- Geometry - An alloy of copper is 10% copper and weighs 25 pounds. A second alloy...

More Related Questions