SOLUTION: A car has a 15 quart capacity. There are 12 quarts with 30% antifreeze solution. How many quarts of pure antifreeze will you need to strengthen the solution to 40%? Please help!

Question 632472: A car has a 15 quart capacity. There are 12 quarts with 30% antifreeze solution. How many quarts of pure antifreeze will you need to strengthen the solution to 40%?
Please help! Thanks!
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = quarts of pure antifreeze needed
quarts of pure antifreeze in 30% solution
-------------

2 quarts of pure antifreeze are needed
check:

OK
and since is les than , the capacity
is not exceeded
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