A large aquarium contains only two kinds of fish, guppies and swordtails. If of the number of guppies is equal to of the number of swordtails, then what fraction of fish in this aquarium are guppies?
Thus, G:S = 8:9. Guppies account for 8 “parts” of the fish, and swordtails account for 9 “parts.” This means that, altogether, there must be 8 + 9 = 17 “parts” in the whole aquarium. Thus, in the whole aquarium, guppies are 8 parts out of 17 parts, or of the whole aquarium.
Answer = (B)
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