2/5 of the fish in an aquarium are red and 1/4 of the fish are brown. 1/2 of the red fish and 2/5 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?
Choose the correct option:
A) 1/3  B) 2/5  C) 3/10  D) 3/20  E) 7/20
1/2*2/5 + 2/5*1/4 = 3/10   The answer is 3/10.
<result>C</result>
2/5 of the fish in an aquarium are red and 1/4 of the fish are brown. 1/2 of the red fish and 2/5 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?