SOLUTION: how much water should be added to a 20L of a 20% salt solution to dilute it to 15% salt solution

Question 941399: how much water should be added to a 20L of a 20% salt solution to dilute it to 15% salt solution
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
how much water should be added to a 20L of a 20% salt solution to dilute it to 15% salt solution
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Equation:
water + water = water
0.80*20 + 1*x = 0.85(20+x)
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80*20 + 100x = 85*20 + 85x
15x = 5*20
x = 6 2/3 L (amt of water to add)
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Cheers,
Stan H.
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