SOLUTION: It is necessary to have a 40% antifreeze solution in the radiator of a certain car. The radiator now has 70 liters of 20% solution. How many liters of this should be drained and re

Question 405328: It is necessary to have a 40% antifreeze solution in the radiator of a certain car. The radiator now has 70 liters of 20% solution. How many liters of this should 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!
It is necessary to have a 40% antifreeze solution in the radiator of a certain car. The radiator now has 70 liters of 20% solution. How many liters of this should be drained and replaced with 100% antifreeze to get the desired strength?
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Equation:
anti -anti + anti = anti
0.20*70-0.20x+1x = 0.40*70
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Multiply thru 100 to get:
20*70 - 20x + 100x = 40*70
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80x = 20*70
x = (1/4)*70
x = 17.5 liters should be removed and replaced.
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cheers,
Stan H.
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