SAN ANTONIO, Oct. 28 (UPI) -- A Thai restaurant in Texas is boggling its customers' minds by offering free WiFi that nonetheless comes with a price -- the password is a complex math equation.

YaYa's Thai restaurant in San Antonio posted its "WiFi password" just above the sign about minimum credit card purchase amounts, but the Internet access has proven difficult for customers to come by because the "password" is listed as a math equation.


A photo of the sign was posted to Reddit, where users -- even those well-versed in math -- were equally perplexed.

Some users suggested the problem was a trick question, while others said the math equation appears to have several solutions.

The user who uploaded the photo promised to attempt some of the suggested solutions and report back with his findings.