A Logic Puzzle

Can you solve this logic puzzle from TED-Ed?

This has been called one of the hardest logic puzzles in the world. Can you solve it? 

Can you solve this logic puzzle?
This has been called one of the hardest logic puzzles in the world. Can you solve it?Find out the answer here: http://ow.ly/Ooxta
Posted by TED-Ed on 16 Июнь 2015 г.