Mac's farm has a total of 18 horses and 27 cows. What is the ratio of horses to the cows in simplest form?

To find the ratio of horses to cows, we need to divide the number of horses by the number of cows.

Ratio = Number of horses / Number of cows

Ratio = 18 horses / 27 cows

To simplify this ratio, we can divide both numbers by 9.

Ratio = (18 horses / 9) / (27 cows / 9)

Ratio = 2 horses / 3 cows

Therefore, the ratio of horses to cows in simplest form is 2:3.