SOLUTION: A mechanic is working on a car with a 20-qt radiator containing a 60% antifreeze solution. How much of the solution should he drain and replace with pure water to get a solution th

Question 831546: A mechanic is working on a car with a 20-qt radiator containing a 60% antifreeze solution. How much of the solution should he drain and replace with pure water to get a solution that is 50% antifreeze?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = quarts of solution that musty be drained
and replaced with pure water
= quarts of pure antifreeze in the solution
that is drained from radiator
= quarts of pure antifreeze originally
in the radiator
-------------------------

3.333 quarts of the solution should he drained and replaced
with pure water to get a solution that is 50% antifreeze
-------------------
check answer:
quarts of pure antifreeze is drained
There is
quarts of pure antifreeze left
The concentration after the quarts of water is
poured in is:

= 50% antifreeze
OK

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