SOLUTION: How much water should be added to 6L of antifreeze to make a solution that is 70% antifreeze?

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Question 316589: How much water should be added to 6L of antifreeze to make a solution that is 70% antifreeze?
Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
How much water should be added to 6L of antifreeze to make a solution that is 70% antifreeze?
.
Let x = liters of water to add
then
6 = .70(x+6)
6 = .70x+4.2
1.8 = .70x
1.8/.70 = x
2.57 liters = x