SOLUTION: a solution of 16 pints of salt and water is 25% salt. how much water must be added to produce a solution which is 20% salt?

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Question 769182: a solution of 16 pints of salt and water is 25% salt. how much water must be added to produce a solution which is 20% salt?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
25% salt solution? Not likely. Ignoring that,

All in variables:
w = pints of water to add, UNKNOWN
c = concentration as percent of available salt solution, 25%
v = pints of the available salt solution to start, 16 pint
f = the concentration of salt wanted, when finished, 20%

Equation:
highlight%28vc%2F%28v%2Bw%29=f%29
Solve for w.