[Solved] A book slipped from a man’s hands and fell on the floor with a loud noise. 20 eyes looked at him. How many people were in the library?

This riddle has been around for some time on internet platforms such as Instagram, Facebook, and WhatsApp, and many people still argue over what the answer might be, as there are many possibilities. The correct answer is 11 people were in the library. We have 2 eyes each, and there was no mention about the pairs of eyes. So we have 10 people in addition to the man who dropped the book. He can’t look at himself, but he’s still in the library.