How many people from other cities take admission in MBA colleges (JBIMS, NMIMS, Welingkar) in Mumbai? Generally what is the ratio in a batch?

To answer this question accurately might be difficult since we do not have the internal data with us and the exact numbers can vary year to year. But, commonly, large numbers of students are from outside Maharashtra.

In JBIMS, the number of non-domicile seats is 18 out of 120, so you can't expect those 18 students to be from outside Maharashtra. It is worth noting that the exact ratio would also depend on several factors like the college's popularity, the number of seats available, and the program they are offering.