SOLUTION: What amount of H2O must be added to 1L of 7% vinegar to reduce it to 5%?

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Question 829478: What amount of H2O must be added to 1L of 7% vinegar to reduce it to 5%?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
.07*1=.05*(1+x)
.07*1=.05*1+.05x
.02*1=.05x
.02/.05-x
.4=x