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A radiator contains 20 liters of a mixture which is 40% antifreeze.  You want to drain off and add an equal volume of antifreze to bring the percentage up to 60%.  How many liters should you drain off?

 May 31, 2020
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40% x 20 = 8 liters of antifreeze
60% x 20 = 12 liters of other mixtures.
Let the number of liters to be drained =L
0.4*20 =0.6*[20 - L], solve for L
L =20/3 =6 2/3 liters has to be drained and replaced with 6 2/3 liters of 100% antifreeze.

 May 31, 2020

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