Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

Count the squares in the matchstick puzzle below?

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

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

Prove that twice of ten is the same as twice of eleven.

You are an expert on paranormal activity and have been hired to locate a spirit haunting an old resort hotel. Strong signs indicate that the spirit lies behind one of four doors. The inscriptions on each door read as follows:

Door A: It's behind B or C
Door B: Its behind A or D
Door C: It's in here
Door D: It's not in here

Your psychic powers have told you three of the inscriptions are false, and one is true. Behind which door will you find the spirit?

I add 5 to 9 and get 2. The answer is correct, so what am I?

Can you find the six hidden animals in the picture below?

What begins with T, ends with T, and has T in it?