A survey of 535 adults aged 18-24 year olds was conducted in which they were asked what they did last Friday night. It found:

• 165 watched TV
• 189 ate pizza
• 46 watched TV and ate pizza, but did not hang out with friends
• 45 watched TV and hung out with friends, but did not eat pizza
• 27 hung out with friends and ate pizza, but did not watch TV
• 33 watched TV, hung out with friends, and ate pizza
• 93 did not do any of these three activities

How many 18-24-year-olds (of these three activities) only hung out with friends last Friday night?