SOLUTION: How much fresh water must be added to 3 L of 10% salt water to make the solution 5% salt water?

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Question 993498: How much fresh water must be added to 3 L of 10% salt water to make the solution 5% salt water?
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
3 l *0.10=0.3
add x liters with no salt
(3+x) *0.05=0.15+0.05x
0.3=0.05x+0.05 x
0.10x=0.3
x=3 liters
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Easier way
You are diluting the solution in half from 10% salt to 5% salt.
This will mean you are doubling the amount of solution, so you add 3 liters of water.