The aquarium has 1 fewer red fish than blue fish. 60 percent of the fish are blue. How many blue fish are in the aquarium? Show your work.

Answer 1

60% are blue.

3 / 5 are blue

2 / 5 are red

There are 3 blue fish and 2 red fish.

Answer 2

Let's introduce variables first:

R - red fish

B - blue fish

Now we are ready to read the problem from the beginning making system of equations.

1 fewer red fish than blue fish.

R = B - 1

60 percent of the fish (R+B) are blue

0.6 (R+B) = B

Solving this system of equations gives B = 3 (R = 2)