SOLUTION: A goldsmith has 10g of a 50% gold alloy. How many grams of pure gold should be added to the alloy to make an alloy which is 75% gold?

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Question 800175: A goldsmith has 10g of a 50% gold alloy. How many grams of pure gold should be added to the alloy to make an alloy which is 75% gold?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
(10*.5)+x=.75(10+x)
5+x=7.5+.75x
.25x=2.5
x=10
check
5+10=.75(20)
15=15
ok