Answer :

AL2006
There are  62.9  students and  11.1  teachers.

Weird, I know.  But my math is bullet-proof.
luana
[tex]Sum\ of\ students\ and\ faculty:\\17x+3x=74\\\\ 20x=74\ \ |:20\\ \\x=3,7\\\\ Faculty: \ \ 3x=3*3,7=\textbf{11,1}\\ Students:\ \ 17x=17*3,7=\textbf{62,9} [/tex]