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?
Answer
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.