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How manny lb's of solder with 65% tin & 35% lead must be combined with another solder with 25% tin & 75% lead to make 80lb of solder with 50% tin & 50% lead?


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75 percent lead plus 35 percent lead would equal 110 percent. To get 50 percent you would need 25 percent from each batch of solder.

Answered by Dawn P. -

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