SOLUTION: I have 80% solution (vinegar) and need 7% solution (Vinegar). How much water do I have to add to get the result?

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Question 584698: I have 80% solution (vinegar) and need 7% solution (Vinegar).
How much water do I have to add to get the result?
Found 2 solutions by richwmiller, amalm06:
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
Depends how much you have (x) or how much you want to have (x+y).
.80x=.07(x+y)
or from standpoint of water
.20x+1.0y=.93(x+y)

Answer by amalm06(224) About Me  (Show Source):
You can put this solution on YOUR website!
(0.80)(x)+0=(0.7)(x+w), where x is the amount of vinegar and w is the quantity of water
0.8x=0.7x+0.7w
0.1x=0.7w
w=(7/10)x (Answer)