There are 240 second year students in a B-School. The Finance area offers 3 electives: Financial Derivatives (FD), Behavioural Finance (BF), and Security Analysis (SA).
- 4 students have taken all three electives.
- 48 students have taken FD.
- The number of students who study FD and SA but not BF is twice the number of students who study FD and BF but not SA, and 4 times the number of students who study all three.
- 124 students study SA.
- 59 students do not take any of these subjects.
- The number of students who study FD and SA but not BF is equal to the number of students who study BF and SA but not FD.
Question: How many students study Behavioural Finance (BF) only?