Are you smarter than a showering Westin hotel guest?

In an attempt to stimulate their patrons’ brains, the Westin has been posting signs throughout their hotel with various tips for life, love, and increasing one’s intellectual horsepower. The latest, and perhaps most disturbing, includes a math problem posted on the shower wall. Naturally, updated daily.

Can you solve it? It’s actually not as hard as it seems.

My favorite part is how they have been periodically substituting in other signs that don’t have math problems at all. Instead, they tell me to “Take your workout to the next level by using Wii Fit”. Did they really not expect me to notice such blatant advertising?

P.S. – when you click to see the enlarged version, you’ll likely see the answer written upside down on the bottom left corner.