A toy farm set contains the plastic animals given in the table below.
Animal Number of Animals
Cows:9
Horse:16
Pigs:15
Sheep:8
Chickens:12

The ratio of cows to pigs can be expressed as 3:
.

The ratio of horses to chickens can be expressed as
:3.

The ratio of sheep to the total number of animals can be expressed as 2:
.