SOLUTION: metalworker has a metal alloy that is 3030​% copper and another alloy that is 6565​% copper. How many kilograms of each alloy should the metalworker combine to create

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Question 1106872: metalworker has a metal alloy that is 3030​% copper and another alloy that is 6565​% copper. How many kilograms of each alloy should the metalworker combine to create 120120 kg of a 5151​% copper​ alloy?

Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
x, mass of the 30% copper alloy
120-x, mass of the 65% alloy

30x%2B65%28120-x%29=51%2A120
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