A University is hosting its annual actuarial alumni event that will host 150 people. You are given the following about the attendees:

• 75 have the ASA designation
• 50 have the FSA designation
• 35 have the ACAS designation
• 30 have the FCAS designation
• 90 have two designations
• None of the attendees have more than two designations

The ASA designation is required to get the FSA designation and the ACAS designation is required to get the FCAS designation. Determine the number of attendees who are associates (ASA or ACAS) but not fellows (FSA or FCAS).

• 15
• 20
• 25
• 30
• 40