SOLUTION: Peggy has a 500 milliliters of a 60% solution of copper sulfate. How many milliliters of a 30% solution of copper sulfate should be added to obtain a 50% solution?

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Question 61434This question is from textbook Algebra 1
: Peggy has a 500 milliliters of a 60% solution of copper sulfate. How many milliliters of a 30% solution of copper sulfate should be added to obtain a 50% solution? This question is from textbook Algebra 1

Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
500*.6+.3x=(500+x).5
300+.3x=250+.5x
.3x-.5x=250-300
-.2x=-50
x=-50/-.2
x=250 ml of 30% copper sulfate is needed
proof
500*.6+.3*250=(500+250).5
300+75=750*.5
375=375