SOLUTION: A solution of 60 ml is 50% acid. How many ml of water must be added to create a 30% acid solution? I tried solving this problem but got a negative answer... I put the questio

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Question 404642: A solution of 60 ml is 50% acid. How many ml of water must be added to create a 30% acid solution?
I tried solving this problem but got a negative answer...
I put the question in this form- W+.50(60)=.30(W+60)
Thank you.

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
A solution of 60 ml is 50% acid. How many ml of water must be added to create a 30% acid solution?
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60 ml of 50% has 30 ml of acid.
For 30 ml to be 30%, the total must be 100 ml
Add 40 ml of water.
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You can do it this way:
T = w + 60 (total solution)
0.5*60 + w*0 = 0.3(w + 60) (total acid)
30 = 0.3w + 18
0.3w = 12
w = 40 ml