Hi,

How much pure antifreeze must be added to 12 gallons of

 20% antifreeze to make a 40% antifreeze solution?            

            antifreeze = antifreeze



 

 

  x = 4 gal

One computer printer can print a company's mailing labels in

 40 minutes..A second printer in 60 minutes   

Time Togeiher: PER min KEY

 1/40 + 1/60 = 1/x

  60x + 40x = 2400   

    100x = 2400    |Multiplying thru by 2400x so as all denominators = 1

       x = 24 min 

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