SOLUTION: How much water must be added to 6 ounces of a 20% acid solution to obtain a 15% acid solution?

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Question 446543: How much water must be added to 6 ounces of a 20% acid solution to obtain a 15% acid solution?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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How much water must be added to 6 ounces of a 20% acid solution to obtain a 15% acid solution?
:
Let x = amt of water
:
Write an amt of acid equation, (the amt of acid remains the same only the percent changes)
.20(6) = .15(x+6)
1.2 = .15x + .9
1.2 - .9 = .15x
.3 = .15
x = .3%2F.15
x = 2 oz of pure water required
:
:
Prove this by finding the amt of acid in each mixture
.2(6) = 1.2
.15(2+6) = 1.2