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In an alloy of 150 pounds of zinc and copper, there are 100 pounds of copper. How much copper must be added so that the alloy may be 10% zinc?

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In an alloy of 150 pounds of zinc and copper, there are 100 pounds of copper. How much copper must be added so that the alloy may be 10% zinc?

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You have 50lb of zinc. And you want that to be 10% The whole must be 500lb There must be 450lb of copper. But you already have 100lb of copper. So you have to add some.

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350 pounds of copper should be added. So you have a total of 450 pounds of copper plus 50 pounds of zinc.

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