SOLUTION: David helped his father stock the pond with baby catfish and blue gill. They put in a total of 75 fish. If the number of blue gill was doubled and the number of catfish tripled, th

Algebra ->  Customizable Word Problem Solvers  -> Age -> SOLUTION: David helped his father stock the pond with baby catfish and blue gill. They put in a total of 75 fish. If the number of blue gill was doubled and the number of catfish tripled, th      Log On

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Question 399438: David helped his father stock the pond with baby catfish and blue gill. They put in a total of 75 fish. If the number of blue gill was doubled and the number of catfish tripled, there would be 175 fish in the pond. How many catfish were put in the pond?
Answer by ewatrrr(24785) About Me  (Show Source):
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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