SOLUTION: How many parts of a 3% solution must be mixed with a 30% solution to obtain a 12% solution?

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Question 751935: How many parts of a 3% solution must be mixed with a 30% solution to obtain a 12% solution?
Answer by tommyt3rd(5050) About Me  (Show Source):
You can put this solution on YOUR website!
Without more information the only thing we can write is
0.03x+0.30y=0.12(x+y)


:)