SOLUTION: 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

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(39617) (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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