SOLUTION: 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

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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  
--------------------------------------------------------------------------
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
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