**Guy Stumps Girlfriend with Simple Math Riddle...**

[https://www.youtube.com/watch?v=4D1d8ipjblE](Video Link)It's a complicated algebra problem. She does pretty good considering that she doesn't have pencil, paper, and a calculator.The big brother is 4 years old. His litt...

http://www.neatorama.com/2016/03/28/Guy-Stumps-Girlfriend-with-Simple-Math-Riddle/