Hey there!
Knowing that in total there are 250 sheep and 35% of the 250 are white, in order to solve for the amount of white sheep, you must multiply the percentage of white sheep by the total number of sheep. In other words, percent*whole. This should be represented by this expression:
35%*250
Now, convert 35% to a decimal so you can multiply it to 250:
35%=0.35
Finally, simplify:
0.35*250
=87.5
Because you cannot have half of a living sheep, you would round to the nearest sheep, making your answer approximately 88 white sheep.
Hope this helps and have a marvelous day! :)