SOLUTION: how much of a 25% solution must be added to a gallon of water to get a 2.8% solution?

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Question 880341: how much of a 25% solution must be added to a gallon of water to get a 2.8% solution?
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
This depends on densities and how the percent is intended. ASSUMING you are dealing with %v/v, set the equation as this:

Let x = VOLUME of the 25% solution to add.
highlight_green%2825x%2F%28x%2B1%29=2.8%29.
Solve for x. The result for x is VOLUME as GALLONS.