In my fish tank, the ratio of red fish to blue fish is 1:5. There are 15 blue fish. How many red fish are there?

3 red fish

Step-by-step explanation:

the ratio of red to blue is 1:5

15 corresponds to 5 so we would have to do 15/3 to get 5

to find the red fish we would do it backwards, doing 1*3 to get 3

there are 3 red fish

Step-by-step explanation:

1:5

_:15

5 times 3 = 15

so 1 times 3 = 3