Question

Some students, during a study, caught, marked and
released 80 fishes in a pond. Later 100 fishes were
caught at random. Among these 40 were found to
be marked. What is the approximate number of
fishes in the pond?
(1) 50
(2) 100
(3) 200
(4) 4000
​

Answer 1

Answer:

200

Explanation:

Initially the students caught 80 fish and put them back in the pond, later they caught 100 at random but 40 out of the 100 were marked meaning they had been caught initially so unmarked fish out of the ones caught are 60, when you add the 80 marked fish and the unmarked fish you get 140 fish, which approximates to 200 fish in the pond.