Guy Stumps Girlfriend with Simple Math Riddle

In this funny video, YouTube user Xmintyx blows his girlfriend’s mind with the basic math question, “If a big brother is 4-years-old, and his younger brother is half his age, how old will the little brother be when the big brother is 100-years-old.”

Related: Guy Can’t Figure Out What ‘E-Y-E-S’ Spells

[Xmintyx]