in a certain pond , 30 fish were caught , tagged , and returned to the pond . a few days later , 30 fish were caught again , of which 2 were found to have been tagged . if the percent of tagged fish in the second catch approximates the percent of tagged fish in the pond , what ` s the approximate number of fish in the pond ?
"if x is total number of fish in the pond : 4 = 30 / x * 100 = > x = 750 so answer is b"
divide(30, divide(2, 30))