Let m be the number of male fish; f is the number of female fish

m + f = 40

$5m + $7f = $236

1. Solve for f.

f = 40 - m

5m + 7 (40 - m) = 236 (substituted 40-m for f)

5m + 280 - 7m = 236 (multiplied 7 through)

-2m + 280 = 236

-2m + 280 - 280 = 236 - 280

-2m = -44

m = 22

2. There are 22 male fish

40 - 22 = 18 female fish

40 was the total number of fish. 22 was number of male fish.

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