Hi

Let x represent  the capacity of the fish tank

Question states***Write as we Read

 x - (2/3)*(3/4)x = 10gal

  x - (6/12)x = 10gal

      x/2 = 10gal

       x = 20gal, the capacity of the fish tank



CHECJING our Answer

 20gal - 2/3* 15gal = 10gal 

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