Question 394180
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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