SOLUTION: The radiator in a car is filled with a solution of 70 per cent antifreeze and 30 per cent water. The manufacturer of the antifreeze suggests that for summer driving, optimal coolin

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Question 1060443: The radiator in a car is filled with a solution of 70 per cent antifreeze and 30 per cent water. The manufacturer of the antifreeze suggests that for summer driving, optimal cooling of the engine is obtained with only 50 per cent antifreeze. If the capacity of the radiator is 3.4 liters, how much coolant (in liters) must be drained and replaced with pure water to reduce the antifreeze concentration to 50 per cent?
Not sure what category this question falls under so I have posted it here, because all my other questions were asked here.

Found 2 solutions by josgarithmetic, ikleyn:
Answer by josgarithmetic(39620)   (Show Source): You can put this solution on YOUR website!
The radiator drain-and-replace problem, full general solution lesson
Answer by ikleyn(52802)   (Show Source): You can put this solution on YOUR website!
.
The radiator in a car is filled with a solution of 70 per cent antifreeze and 30 per cent water. The manufacturer of the antifreeze
suggests that for summer driving, optimal cooling of the engine is obtained with only 50 per cent antifreeze.
If the capacity of the radiator is 3.4 liters, how much coolant (in liters) must be drained and replaced with pure water
to reduce the antifreeze concentration to 50 per cent?
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It is one of the standard word problems on mixtures.

For the solution, see the lesson
    - Word problems on mixtures for antifreeze solutions, Problem 4
in this site.

The Problem 4 from this lesson is and exact analogue/prototype/sample to your problem.
Read it attentively and then solve your problem by operating with your input numbers.

There is entire bunch of lessons covering various types of mixture problems
    - Mixture problems
    - More Mixture problems
    - Solving typical word problems on mixtures for solutions
    - Word problems on mixtures for antifreeze solutions
    - Word problems on mixtures for alloys
    - Typical word problems on mixtures from the archive
in this site.

Read them and become an expert in solution the mixture word problems.

Also, you have this free of charge online textbook in ALGEBRA-I in this site
    - ALGEBRA-I - YOUR ONLINE TEXTBOOK.

The referred lessons are the part of this online textbook under the topic "Mixture problems

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