Jean stocked her aquarium with 36 fresh-water fish, which cost $212. The male fish cost $5 each, while the female fish cost $7. Find the number of male fish and the number of female fish.

Question

Mathematics

Lewis Aguirre

12 April, 19:20

Jean stocked her aquarium with 36 fresh-water fish, which cost $212. The male fish cost $5 each, while the female fish cost $7. Find the number of male fish and the number of female fish.

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Answers (1)

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Giovanny Hendrix · Answer 1

For this question, we need to translate into equations to solve it. There are total 36 fish (male and female). Let's say we have x male and y female. Then x+y=36.

We know the total cost is $212, $5 for each male and $7 for each female, thus, the relation is 5x+7y=212.

Now, we solve the system:

x+y=36

5x+7y=212 to get x=20 and y=16. Which means the number of male fish is 20 and the number of female fish is 16.