Question

The university has __________ students attending from other countries. Which word belongs in the blank? less lesser few fewer

Answer 1

The university has fewer students attending from other countries. 
This is because of the countable rule: Lesser is used for the things you don't count while fewer is used for the things you count.
Other examples:
fewer potatoes for the salad          less potato salad

So, the answer should be fewer. 

Answer 2

I believe the answer should be few because there are not many students from other countries in universities and fewer and less students would both mean basically the same thing and would be comparing the amount of foreign students to another category which it does NOT mention.

i did not make for 100% sure this is correct but it seems that people are not liking the other answer and this makes the most sense to me hope it is helpful.