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berrypicking
a game forester tags 20 rabbits in the woods. the next month he returns and observes a sample of 12 rabbits, 5 of which are tagged and a sample of 25 rabbits, 9 of which are tagged. if the 2 samples are representative of the rabbit population, which is the best estimate of the number of rabbits in the woods?
I'd see it as one big sample of 37 animals, of which 5+9=14 are tagged. So 14/37 is tagged. (about 0.378th) If you divide 20 by 14/37, you get an estimate of the total number of rabbits.