SOLUTION: How many litres of pure antifreeze must be added to 7 litres of a 10% antifreeze solution to obtain a 50% antifreeze solution ?? Having trouble with this one for school . Thank you
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Question 1050545:  How many litres of pure antifreeze must be added to 7 litres of a 10% antifreeze solution to obtain a 50% antifreeze solution ?? Having trouble with this one for school . Thank you so much  
Found 2 solutions by  josmiceli, ikleyn:
Answer by josmiceli(19441)   (Show Source): You can put this solution on YOUR website!
 Let  = liters of pure antifreeze to be added
 liters of pure antifreeze in
the 10% solution
----------------------
5.6 liters of pure antifreeze must be added
----------------
check:
OK 
Answer by ikleyn(52903)   (Show Source): You can put this solution on YOUR website!
 .
See the lesson
    - Word problems on mixtures for antifreeze solutions 
in this site.
You will find the solutions for all types of mixture problems on antifreeze.
 
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