SOLUTION: how much water (0% strength) should be added to 8L of 6% saline solution to reduce the strength to 4%? How do I solve problems like this one?

Question 745379: how much water (0% strength) should be added to 8L of 6% saline solution to reduce the strength to 4%?
How do I solve problems like this one?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
how much water (0% strength) should be added to 8L of 6% saline solution to reduce the strength to 4%?
Equation:
salt + salt = salt
0.06*8 + 0*x = 0.04(8+x)
--------
6*8 + 0 = 4*8 + 4x
-----
2*8 = 4x
x = 4 L (amt. of water to add)
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Cheers,
Stan H.
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