Sherlock Holmes was challenged to make a pre-drawn line smaller without erasing it. He did it in fractions of seconds. How?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

Why is the Hole below a Lock?

In order to complete the racing competition, the Mexico racetrack has to submit its top and the most famous three horses to win the competition. Due to an electrical storm, all the records are cleared and no one knows which horse holds the record. They all look identical and it becomes even more difficult to differentiate the horses. There are 25 horses in the Mexico racetrack. But there can be only five horses at a time on the track. What will the least number of races that can be conducted to find out the three fastest horses?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?

If your uncle’s sister is not your aunt, what relation is she to you?

Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I

I was born in a small house and I live in it all alone. No windows and no doors have been assigned to my house. The only way I can go out is by breaking through the walls of my house.

Who am I?

If eleven plus two equals one, what does nine plus five equal?