A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is that man?

In case you were starting to feel confident, this one was meant for third graders in Vietnam. The answer is 66, but we don't blame you for scratching your head about how they got there.

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 need to arrange three 7 and mathematical symbols to form number 1?

There is a brick of gold and a brick of iron in a boat (both 10-inch blocks), if they are both dropped into the water which will make the water level higher?

13 decks of cards have been mixed. What is the minimum number of cards that must be taken out from the above-mixed cards to guarantee at least one 'four of a kind?

How many words can a quill made with the feather of a pigeon write with a 100ml bottle of black ink?

Find the missing number in the image below.

A man is trapped in a room. The room has only two possible exits doors. Through the first door there is a room constructed from magnifying glass. The blazing hot sun instantly fries anything or anyone that enters. Through the second door there is a fire-breathing dragon. How does the man escape?

Can it be possible to build a house that has all its four walls facing towards the South?