SOLUTION: how much of a 30% salt solution must be mixed with 70 gallons of a 12% salt solution to obtain a solution that is 20% of salt?

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Question 795639: how much of a 30% salt solution must be mixed with 70 gallons of a 12% salt solution to obtain a solution that is 20% of salt?
Answer by tommyt3rd(5050) About Me  (Show Source):
You can put this solution on YOUR website!
my screen is very small right now, so I'm going to write the short, sweet answer...
0.3x+70*0.12=(x+70)*0.2
which gives us x=56