Question 399438
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Hi
Let x and y represent the number of catfish and blue gills respectively 
Question states***
 x + y = 75
3x + 2y = 175
Solving for x by sustitution:  y = 75-x
 3x + 2(75-x) = 175
          x = 25, the number of catfish.  50 the number of bluegills  (75-25)
CHECKING our Answer***
 3*25 + 2*50 = 175