SOLUTION: 10 kg of copper were mixed with 5 kg of tin which costs $10/kg to make bronze which cost $8/kg. What is the price per kg of copper?

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Question 447245: 10 kg of copper were mixed with 5 kg of tin which costs $10/kg to make bronze which cost $8/kg. What is the price per kg of copper?
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
copper 10kgs x/kg
Tin 5kgs 10/kg
15=8/kg
10x+50=120
10x=70
x=7
$ 7 / kg copper