SOLUTION: how much pure acid should be mixed with 5 gallons of 40% acid in order to get a 50% acid solution?

Question 868555: how much pure acid should be mixed with 5 gallons of 40% acid in order to get a 50% acid solution?
Found 2 solutions by ewatrrr, richwmiller:
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!

Hi
x + .40(5gal) = .50(.40 +x)
x = .10(5gal)/.5
recommend keeping the details intact and then use calculator (easy to check setUP)
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
.40*5+x=.5(5+x)
x=1

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