Question

Some students, during a study, caught, marked and released 80 fish 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?

• A. 50
• B. 100
• C. 200
• D. 4000

Answer 1

Answer: (C)

200

Let the number of fishes in the pond be x. Out of 100, 40 fishes were found to be marked. That is 40% of total fishes are tagged. Here, 40% of x is 80. Hence, x is equal to 200.

Thus, the correct answer is '200.'