Which word in the dictionary is spelled incorrectly?

One year ago a man was four times as old as his son. After 6 years, his age exceeds twice his son's age by 9 years. Find their present ages?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

A man is found dead on a monday night. His wife calls the police immediately. The police question the wife and staff. The wife said she was asleep, the cook said he was cooking lunch, the gardener said she was picking vegetables, the butler said he was cleaning the closet, and the maid said she was sweeping. The police immediately arrested the murderer.Who was the murderer?

A robber enters a house and threatens the Woman in the house, and he forces her to open the locker. The woman says, "The code for the locker is different every day, and if you kill me you'll never get the code". But still the robber manages to guess the code on his own How did he do it?