Hi, Good set-up work..note using p for paul's age

George is twice as old as paul

Let p and 2p represent paul and george's ages respectively

Question states***Togather, george and Paul have lived 18 years

  + 2p = 18

   3p = 18

    p = 6, paul's age.  George is 12  (2*6)

CHECKING our Answer*** 

 6 + 12 = 18

    

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