Type the correct answer in each box. Use numerals instead of words. If necessary, use / for the fraction bar(s).
A toy farm set contains the plastic animals given in the table below.
Animal Number of Animals
Cows 9
Horses 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:.