Let the number of supervisors be n and the number of unicorns be u .
It is given there are 2 supervisors for every 18 unicorns.
The equation that shows the relationship between the number of supervisors (n) and the number of unicorns (u) is :For every 2 supervisors there are 18 unicorns .The question is asking to write an equation for n and U.
2U=18n
Or u=9n.