Final answer:
The horses are fed 5/9 of a bale of hay each day.
Step-by-step explanation:
To find how many bales of hay the horses are fed each day, we need to multiply the amount of hay fed to the cattle by 2/3.
The amount of hay fed to the cattle is 5/6 of a bale, so multiplying 5/6 by 2/3 gives us 10/18.
Simplifying 10/18, we get 5/9 of a bale. Therefore, the horses are fed 5/9 of a bale of hay each day.