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.

There are 3 blue fish in the aquarium.

Step-by-step explanation:

x = the number of red fish

y = the number of blue fish

x=y-1 is equation A

0.60 (x+y) = y is equation B

substitute equation A in equation B and solve for y

0.60 (y-1+y) = y

0.60 (2y-1) = y

1.2y-0.60=y

1.2y-y=0.60

0.2y=0.60

y=3 blue fish

Find the value of x

x=y-1 is x=3-1=2 red fish

This means that there are 3 blue fish in the aquarium.

Step-by-step explanation:

2 red fish, 3 blue fish = 5 fish total

20% for each fish, 20% x 5 = 100%

2 red fish x 20% = 40%

3 blue fish x 20% = 60%

answer is 3 blue fish