SOLUTION: the radiator in a certain make care needs to contain 40 liters of 40% antifreeze. the radiator now contains 40 liters of 20% antifreeze. how many liters of this solution must be dr

Question 430486: the radiator in a certain make care needs to contain 40 liters of 40% antifreeze. the radiator now contains 40 liters of 20% antifreeze. how many liters of this solution must be drained and replaced with 100% antifreeze to get the desired strength?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
the radiator in a certain make care needs to contain 40 liters of 40% antifreeze. the radiator now contains 40 liters of 20% antifreeze. how many liters of this solution must be drained and replaced with 100% antifreeze to get the desired strength?
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Equation:
alcohol - alcohol + alcohol = alcohol
0.20*40 - 0.20x + 1.00x = 0.40*40
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Multiply thru by 100 to get:
20*40 - 20x + 100x = 40*40
80x = 20*40
x = 10 liters (amt. of liquid to drain and replace_
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Cheers,
Stan H.
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