Hi

Let x represent the number of tiles Ramon took from the box

Amelia took 13 titles from his collection and Kelko took half of those remaining

Question states***Ramon had 11 left 

 x-13 = (x-13)/2 + 11       || Note: idea is:  half = half

   x/2 = 13/2 + 11

     x = 13 + 22

     x = 35

       

  

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