Answer:
8 of the 28 horses would be palomino horses
Step-by-step explanation:
First off, we understand that there are 10 palomino horses and 25 others, meaning there are 35 total.
The question wants to know that if 28 horses came out, how many of them would be palomino horses.
We know that the palomino horses are 
What we need to know is 
to find x, we cross multiply

10 x 28 and 35 x <em>X</em>
<em />
<em>280 = 35x</em>
<em />
<em>Divide both sides by 35</em>
<em />
x = 8
8 of the 28 horses would be palomino horses