Respuesta :

Answer: There are 7 tetra fish and the total is 28 fishes.

Step-by-step explanation:

wegnerkolmp2741o

Answer:

1:4

Step-by-step explanation:

First we need to find the total number of fish

21 goldfish + 7 tetra fish = total fish

28 fish = total fish

tetra: total

7: 28

We can divide each of these numbers by 7

7/7:28/7

1:4

is the ratio.