SOLUTION: How much of a 50% salt solution should be added to 80L of a 5% salt solution to obtain a 30% salt solution?

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Question 857057: How much of a 50% salt solution should be added to 80L of a 5% salt solution to obtain a 30% salt solution?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
How much of a 50% salt solution should be added to 80L of a 5% salt solution to obtain a 30% salt solution?
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Equation:
salt + salt = salt
0.50x + 0.05*80 = 0.30(x+80)
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50x + 5*80 = 30x + 30*80
20x = 25*80
x = 100 L (amt. of 50% solution needed)
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Cheers,
Stan H.
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