Logic will get you from A to B. Imagination will take you everywhere. – Albert Einstein
Known for its jokes and sarcasm, it is hard to see 9GAG as being one to train your mind.
But here is a little quiz for you. It is a matter of how attentive you are to the details and how good is your logical thinking.
If you want to know the answer, you can browse through the comments here. But first, try it out yourself first.