2/5 of the fish in an aquarium are red and 1/4 of the fish are brown. 3/4 of the red fish and 3/5 of the brown fish are male. If the rest of the fish in the aquarium are female, what is the probability that a fish randomly picked from the aquarium is male? Options.
A) 2/5
B) 3/10
C) 7/10
D) 9/20
E) 11/20
3/4*2/5 + 3/5*1/4 = 9/20   The answer is 9/20.
<result>D</result>
2/5 of the fish in an aquarium are red and 1/4 of the fish are brown. 3/4 of the red fish and 3/5 of the brown fish are male. If the rest of the fish in the aquarium are female, what is the probability that a fish randomly picked from the aquarium is male?