Answer:
0.028 goldfish/person
Explanation:
The number of goldfish per person is found by dividing the number of goldfish by the number of persons:
17500 goldfish/(625000 persons) = 175/6250 goldfish/person
= 7/250 goldfish/person = 0.028 goldfish/person
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Additional comment
In the context of math ratios, "per" essentially means "divided by". "Per capita" means "divided by the number of people."