SOLUTION: A car radiator has a 6-liter capacity. If the liquid in the radiators 40% antifreeze, how much liquid must be replaced with pure antifreeze to bring the mixture up to a 50% solutio

Question 312145: A car radiator has a 6-liter capacity. If the liquid in the radiators 40% antifreeze, how much liquid must be replaced with pure antifreeze to bring the mixture up to a 50% solutions?
Found 2 solutions by redheadtie, Fombitz:
Answer by redheadtie(3) (Show Source): You can put this solution on YOUR website!
2.5 more liters
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Let A be the amount of 40% solution currently in the radiator. You add B liters of pure antifreeze (100% solution).
1.
2.
From eq. 2,

Substitute into eq. 1,

Then from eq. 2,

There are currently 5 liters of 40% solution. Adding 1 liter will fill the radiator and make a 50% solution.

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