Question 1196255
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To determine the number of {{{highlight(trouts)}}} in a lake ​, a conservationist catches 450 {{{highlight(trouts)}}}​, tags​ them, and releases them. 
Later 88 {{{highlight(trouts)}}} are​ caught, and it is found that 45 of them are tagged. Assuming that the proportion of tagged {{{highlight(trouts)}}}
in the second sample was the same as the proportion of tagged {{{highlight(trouts)}}}in the total​ population, 
estimate the number of {{{highlight(trouts)}}} in the lake.
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See the lesson

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=http://www.algebra.com/algebra/homework/proportions/lessons/Using-proportions-to-estimate-the-number-of-fish-in-a-lake.lesson>Using proportions to estimate the number of fish in a lake</A>

in this site.


Find there several other similar solved problems.



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As I understand from the post, the word {{{highlight(trout)}}} is a variable value in the source,

which is changed from case to case to create/produce/generate new problems . . .