There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

If 21x = 79x, what is the value of x?

What word is pronounced the same if you take away four of its five letters?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

Let's play a word game. Following are some meaningless words that can be completed by adding random letters on either side of the word.

For example, the word "rdo" can be formed into "pardon".

Using the same technique, can you complete the given words?
ecalc
airb
rinci
tibac
uidel
gorit
igna
eyho

Nodes are shown below and you need to connect them based on the following rule: Every node can be connected to the number of nodes inside them, i.e. the first node there is a value of 1 which indicates that the first node can connect to exactly one node only.Can you do it?

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

A bomb exploded in a room full of married couples and no one died. How?

You see a mathematical expression in the picture. Can you think of a movie that this expression refers to?

A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it take the entire train to pass through the tunnel?