What two things can you never eat for breakfast?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

100 prisoners are stuck in the prison in solitary cells. The warden of the prison got bored one day and offered them a challenge. He will put one prisoner per day, selected at random (a prisoner can be selected more than once), into a special room with a light bulb and a switch which controls the bulb. No other prisoners can see or control the light bulb. The prisoner in the special room can either turn on the bulb, turn off the bulb or do nothing. On any day, the prisoners can stop this process and say "Every prisoner has been in the special room at least once". If that happens to be true, all the prisoners will be set free. If it is false, then all the prisoners will be executed. The prisoners are given some time to discuss and figure out a solution. How do they ensure they all go free?

Detective Rockford was jogging near the beach at 4:30 am.
He hears a sound near the shack "No Michael, Please Do not shoot me".
Next instance he heard the sound of gunfire. Rockford rushes to the shack where he finds women lying dead and a gun in close proximity of three "Doctore Lawyer and a Teacher".

Rockford immediately knew that the Lawyer has committed the crime. How?

As you can see that fifteen matches have been used to form an arrangement. What you have to do is remove any six of them to make them ten.

Whats the next number in the below number sequence pattern.

Can you count the number of triangles in the given picture?

The centre of the third figure is empty. What digit should fit inside?

John was piloting a plane behind a car but was never able to overtake it. Why?

The answer I give is yes, but what I mean is no. What was the question?