Question 972639: there are two different copper alloys of total weight 50 kilograms. the first contains 40%less copper than the second one. determine the percentage of copper in first alloy . if it is known that there were 6 kg copper in first alloy and 12 kilograms in second alloy. what is the percentage of copper in second alloy?
Answer by josgarithmetic(39630)   (Show Source):
You can put this solution on YOUR website! x of one alloy, y of the other alloy.
Let p, be percentage of copper in the "y" alloy. The "x" alloy then will have  percent copper.
 , percent copper in x is  .
Determine percent of copper in the first, "x", alloy?
Not enough information for this. You only can find that the x quantity alloy has  percent copper.
 from the description, "there were 6 kg copper in first alloy";
 , from the other part, "12 kilograms in second alloy"
That showed three equations in three unknown variables. Solving for x, y, p should be possible.
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