Question 720803: how much pure antifreeze must be added to 20 L of a solution thaT IS 60% antifreeze to make a solution that is 80% antifreeze Answer by Edwin McCravy(20056) (Show Source):
You can put this solution on YOUR website! how much pure antifreeze must be added to 20 L of a solution thaT IS 60% antifreeze to make a solution that is 80% antifreeze
Percentage Liters of
Liters of expressed as pure antifreeze
liquid a decimal in the liquid
first solution 20 .60 .60(20)
added solution x 1.00 1.00x
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final solution 20+x .80 .80(20+x)
The equation comes from:
.60(20) + 1.00x = .80(20+x)
Solve that and get x = 20 liters.
Edwin
