No cheating! Last night at the book launch of François Nars’ photography book, 15X15, we had to take the opportunity to challenge the pretty faces of the evening to a battle of the brains. So how much is 15×15, anyway? After hours of scouring Industria Superstudio, we finally found one designer who dished out the correct answer. Ring the alarms! A hearty congratulations to smarty (Virgo) pants Phillip Lim! Olivier Theyskens deserves an honorable mention, as he got it right after a second try. For the most part, the answers were, well…you’ll see.

How much is 15×15?
Simon Doonan: Let’s see…4×15 is 45 so…wait…it’s 60…so 15×15 is 180.
Dayle Haddon: 150? This is my worst area!
Erin Fetherston: 175.
Daphne Guinness: 150. No, it’s175.
Amber Valletta: 835?
Anja Rubik: I don’t know!
Lisa Marie Smith: I failed at math.
Francois Nars: I have no idea. I’m terrible at mathematics.
Selita Ebanks: I was an English major!
Jenny Shimizu: 1,734.7. I’m Japanese. I’m good with numbers.
Tyson Ballou: 200?
Olivier Theyskens: This is easy. 175. That’s not it? Can I have a second guess? 225?
WINNER! Phillip Lim: 225.