First, to get the number of first year students, subtract 109 from 289.
Then, since 2/3 of which are female, and what we want is the population of the male, then we get 1/3 of the number of first year students.
=(289 - 109)/3
=180/3 = 60
Hope this helps :)
p.s. If there is a part of my solution that you did not understand, please do not hesitate to contact me and I'll be more than glad to explain it to you thoroughly