Question 614570
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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