SOLUTION: Help..I have examples but I am not getting how they get the 2nd equals to.. How many liters each of a 15% acid solution and a 30% acid solution must be used to produce 60 liters

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Question 362256: Help..I have examples but I am not getting how they get the 2nd equals to..
How many liters each of a 15% acid solution and a 30% acid solution must be used to produce 60 liters of a 20% acid solution?
I know to use substitution. x+y=60 and .15x+.30y= what?

Answer by nyc_function(2741) About Me  (Show Source):
You can put this solution on YOUR website!
mixture 1 + micture 2 = total mixture

0.15x + 0.30x = 0.20(2x + 60)

Can you take it from here?