Hi

Let x represent the amount of pure salt(100%) added...

  Mixing to form (24kg+x)of 40% solution

   .20*24kg + x = .40(24kg+x)

           .60x = .20*24kg

              x = .20*24kg/.60

              x = 8kg, the amount of pure salt that needs to be added



CHECKING our Answer***

   4.8kg + 8kg = 12.8kg = .4*32kg = 12.8kg 

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