Replace the question mark with the correct number below.

Why do we preferably have round manhole covers and not square ones?

What do you see in the image below

Can you find the dog hidden in a group of pandas?

You stand in front of two doors. A guard stands next to each door. You know the following things: one path leads to paradise, the other leads to death. You cannot distinguish between the two doors. You also know that one of the two guards always tells the truth and the other always lies. You have permission to ask one guard one question to discover which door leads to paradise. What one question would you ask to guarantee you enter the door to paradise?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

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

Can you write down eight eights so that they add up to one thousand?

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.

What does an Island and the letter T have in common?