Hi, this previously posted.

Let x and (x-4) represent the number of matches filling 24 amd 28 boxes respectively

Note: the Total number of matches is the same filling the 24 and 28 boxes

 24x = 28(x-4)

solving for x

 24x = 28x - 112

 112 = 4x

  28 = x, the number in each of the 24 boxes

24*28 = 672 is the total number of matches



CHECKING our answer

  24boxes*28matches/box = 28boxes*24matches/box = 672 

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