Question 31045
this is just so you can see the approach:


teachers:students
1:20 or
2:40 or
3:60 or 
4:80 or
5:100 or
6:120 or
7:140 or
8:160 etc...


Answer is 160 students.


Actual method you use is as follows - given 1:20
we then multiply by 8 to give - 8:160


Jon.