\section*{Task 2 - 021212}

A fishery production cooperative wants to know how many fish of a certain species are approximately in a small lake. To this end, 30 fish of this species are caught, marked, and returned to the lake. The next day, 52 fish of the same species are caught, among which 4 are marked.

How many fish of this species were approximately in the lake? (Justification!)