You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

If in a car race, the man who came two places in front of the last man finished one ahead of the man who came fifth, how many contestants were there?

Before Mount Everest was discovered, what was the highest mountain in the world?

Find The Missing Number In the Sequence.
6 25 64 ? 32 1

Make a sentence consisting of three words that have the whole alphabet.

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

John was so frustrated to be the suspect of being a sleeper terrorist that he shoot himself right between the eyes with a revolver in his toilet. The revolver and the bullets were accurate. Minutes later John walks out of the toilet unharmed.
How can this be possible?

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?

You and your two friends are working in a multinational company. How can you three find out the average salary of you all without disclosing your own salary to the other two?

How can a man go eight days without sleep?