SOLUTION: A 12 quart coolong system is tested and found with a 60% antifreeze solution. The ideal mixture should be a 50% antifreeze solution. How many quarts of solution need to be drained

Question 1004911: A 12 quart coolong system is tested and found with a 60% antifreeze solution. The ideal mixture should be a 50% antifreeze solution. How many quarts of solution need to be drained and replaced with pure water to reach the ideal mixture?
Answer by addingup(3677) (Show Source): You can put this solution on YOUR website!
Existing mix: .60
and x= amount to be drained in order to replace with pure water.
12-x= amount of remaining 60% solution
.6(12-x)= .5*12
7.2-.6x= 6 Add -.6x on both sides:
7.2= 6+.6x Subtract 6 on both sides:
1.2= .6x Divide both sides by 2:
x=2 You have to drain 2 quarts.
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