Number of users vs. RAM?

[Paul Deering]

What is the relationship between the number of users on a system
vs. the amount of RAM on the system. We have a Sun 3/260 with
16 MBytes of RAM and would like to teach a fortran/C class of 40
students. How would this affect the performace of the machine?

We also have a couple of Sparc II's. How would these Sparc II's
perform in the same situation as above?

Thank for your help?
Paul Deering