Asked by Marley

If you put 200 tagged fish in a pond, then collect a sample of 50 and 8 of them are tagged. How many fish are in the pond?
Answered by Steve
8 is 16% of the 50 sampled.

That means that 200 is 16% of the whole population.

0.16p = 200
...
Answered by sand
40 out of 72 fish in one lake were tagged by a wildlife researcher. At a second lake, 260 fish were tagged. If fish were tagged at proportional rates in the two lakes, how many fish were in the second lake?