Question 781984
The proportion of tagged bears when they were first released into the population was {{{50/p}}}, using p as the population size.
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The concentration of tagged bears was diluted a year later, to {{{2/100}}}.  These would be equal ratios, ignoring deaths or births.  Note, I say "the concentration", which here is a fraction of the total population and this fraction of the population is 2/100 of the population.


{{{50/p=2/100}}}
{{{50/p=1/50}}}
{{{p/50=50}}}
{{{p=50*50=2500}}}