in an aquarium there are 36 red and some black fish when a fish is removed the probability of getting a black fish is 11/20.Find the number of black fish.
(Plz answer as fast as u can...)

Dear student
Let the number of black fishes be x.Now, probability of getting black fish=Total number of black fishesTotal number of fishes1120=x36+x36×11+11x=20x36×11=9xx=44So, total number of black fishes=44
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