Question 395792
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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