Hi there!

Well in the hostel, the decision for of sharing it in number of students is done by authority itself.

The decision is totally depends on some factors like:

1- No. of students applied for hostels

2- Size of hostel rooms

3- No. of rooms available and many more

However as my experiences the room is shared by 2 to 4 students at any sort of hostels

I hope you will find it useful!