SOLUTION: How much pure acid should be mixed with four gallons of a 40% acid solution in order to get a 70% acid solution?

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Question 838381: How much pure acid should be mixed with four gallons of a 40% acid solution in order to get a 70% acid solution?
Found 2 solutions by ewatrrr, lwsshak3:
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

Let x represent How much pure acid should be mixed

Set Up is:

        Acid = Acid

 .40%2A4+%2B+x+=+.70%284%2Bx%29   | Solve for x

            x+=+%28.30%2A4%29%2F.3

                x = 4gal pure acid should be mixed

Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
How much pure acid should be mixed with four gallons of a 40% acid solution in order to get a 70% acid solution?
***
let x=amount of pure acid should be mixed
40%*4+100%x=70%(4+x)
1.6+x=2.8+.7x
0.3x=1.2
x=4
amount of pure acid should be mixed=4 gal