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?

You want to boil a two-minute egg. If you only have a three-minute timer (hourglass), a four-minute timer and a five-minute timer, how can you boil the egg for only two minutes?

Outside a massage parlour, there is a board that reads
"I only massage those who do not massage themselves."

Reading the above statement, does the masseur massage himself?

How can one talk without saying a single word?

Can you make the number 24 by utilizing the numbers 1, 3, 4 and 6? You must use one number only one time and you can use mathematical operation symbols anytime anywhere.

John is the son of Jacob.
So,
Jacob is the_____of John's father?

There are forty elephants and they have forty-fore heads. How can this be possible?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

You have a basket containing ten apples. You have ten friends, who each desire an apple. You give each of your friends one apple.
Now all your friends have one apple each, yet there is an apple remaining in the basket.
How?