Hi

otto has 4 more cards than zoe

Let x and (x+4) represent the number of cards zoe and otto have respectively

Question states***

  x  + (x+4) = 28

solving for x

    2x = 24

     x = 12, the number of cards zoe has.  Otto has 16.   (12+4)



CHECKING our Answer

   12 + 16 = 28 

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