A group of scientists are studying cod (Gadus morhua) populations in the Southern Gulf of St. Lawrence to see if they are increasing or decreasing in numbers. the scientists are using fish tag data compiled from a sampling series using the mark and recapture method. to estimate the number of cod in the area, the scientists captured 1,500 fish, marked them, and let them go. The next day, they captured 1,675 from the same area. Of these, 270 had been marked the day before. about how many cards are in southern Gulf of St. Lawrence?​