Jolene, Charlie and Natalie were classmates. One of them cleaned up the classroom one day while there was nobody around. Below are their replies when the teacher questioned about who cleaned up the classroom.
Jolene: Charlie cleaned the classroom.
Charlie: I did not do it!
Natalie: Neither did I!
If one of them was telling the truth, who cleaned up the classroom?
Answer
Natalie cleaned up the classroom and Charlie was telling the truth.