Question 685848
A metal alloy weighing 12 lb. and containing
20% copper is melted and mixed with 3 lb. of a
different alloy which contains 40% copper. 
What percent of the resulting alloy is copper?
**
20%*12+40%*3/12+3=(2.4+1.2)/15=3.6/15=.24
What percent of the resulting alloy is copper? 24%