SOLUTION: if i have 20 ounces of a 20% salt solutions, how much salt do i add to make it a 25% solution

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Question 319173: if i have 20 ounces of a 20% salt solutions, how much salt do i add to make it a 25% solution
Answer by nyc_function(2741) About Me  (Show Source):
You can put this solution on YOUR website!
first mixture + second mixture = total mixture
20(0.20) + x = 0.25(x + 20)
Can you solve for x?