Question 1055108
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The cooling system of a car has a capacity of 15 liters. If the system is currently filled with a mixture that is 20​% ​antifreeze, 
how much of this mixture should be drained and replaced with pure antifreeze so that the system is filled with a solution that is 
50% ​antifreeze?
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See the lesson 

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/word/mixtures/Word-problems-on-mixtures-for-antifreeze-solutions.lesson>Word problems on mixtures for antifreeze solutions</A> 

in this site.


Very similar problem was solved there (Problem 4).
Consider it as a sample. Read it attentively.
Then solve your problem by substituting your data.



Also, you have this free of charge online textbook in ALGEBRA-I in this site

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/quadratic/lessons/ALGEBRA-I-YOUR-ONLINE-TEXTBOOK.lesson>ALGEBRA-I - YOUR ONLINE TEXTBOOK</A>.


The referred lesson is the part of this online textbook under the topic "<U>Mixture problems</U>".