SOLUTION: This is a real problem. I make cast bullets from various mixtures of lead (Pb), tin (Sn) and antimony (An).I have a one-pound piece of Pb-Sn mixture, 30% tin and 70% lead. I want

Question 720744: This is a real problem. I make cast bullets from various mixtures of lead (Pb), tin (Sn) and antimony (An).I have a one-pound piece of Pb-Sn mixture, 30% tin and 70% lead. I want to know how much lead I have to add to the one-pound piece to make the mixture 4% tin and 96% lead.
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Be careful with those bullets- just kidding
Let = pounds of lead to be added to mixture
You start out with:
pounds of tin
pounds of lead
------------
( total pounds of lead ) / ( total pounds of metal ) = .96

If you add 6.5 pounds of lead, you will have
4% tin, 96% lead
check:

OK
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