SOLUTION: A silver dollar, an alloy of silver and copper, is 7.5% copper by weight. How many grams of pure copper should be used to prepare a 200 grams of a copper-silver alloy that is 10% c

Question 996494: A silver dollar, an alloy of silver and copper, is 7.5% copper by weight. How many grams of pure copper should be used to prepare a 200 grams of a copper-silver alloy that is 10% copper by weight?
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
x, how many grams pure 100% copper?

200-x, amount of the 7.5% alloy.

two-part mixture, percents, just one variable - video example
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