Hey, remember math? Nah, didn't think so. Chances are, you haven't had to use it for years, despite your seventh-grade algebra teacher swearing those x's, y's, and z's would one day be important (spoiler: they wouldn't). Well, those mystery letters have come back to haunt you, via this simple kids brainteaser making the rounds on social media. 

Have you figured it out? Take a moment. The class will wait.