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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 dou...

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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?

$$x-\ amount\ of\ catfish\\\\ y-\ amount\ of\ blue\ gill\\\\\ \left \{ {{x+y=75} \atop {2y+3x=175}} ight. |using\ substitution\ \ x=75-y\\\\ 2y+3(75-y)=175\\ 2y+225-3y=175\\ -y=-50\ \ |*(-1) y=50\\ x=75-50=25\\ there\ were\ 25\ catfish\ put\ in\ the\ pond$$

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This 51 words question was answered by John B. on StudySoup on 5/31/2017. The question contains content related to Math Since its upload, it has received 197 views.