Based on the sample caught by the scientists, there
are about 1275 fish in the pond.
To use the capture-recapture method to estimate
a population, scientists assume the proportions
of the sample of the marked fish to the total fish in
the sample is the same as the marked fish to the total
fish in the pond.
There were 20 marked
out of 170 of the sample. There were 150
marked out of the total fish in the pond. Thus,
the following relationship is approximately true. Substitute
the information given in the Challenge, then solve the