Answer:
35 horses are not white.
Step-by-step explanation:
First you see how many horses are white. To do this, you create a common denominator. 56 divided by 8 is 7, so you can multiply 8 by 7 to get 56. then you multiply 3 by the same number, so now you have 21/56. 21 of the 56 horses are white. Then subtract 21 from 56, which is 35.
