Who is that with a neck and no head, two arms and no hands? What is it?

What is the four-digit number in which the first digit is one-third the second, the third is the sum of the first two, and the last is three times the second?

What always comes into a house through the keyhole?

I have a mouth but I don't eat.
I have a bank but have no money.
I have a bed but i dont sleep.
I wave but have no hands.

Who Am I ?

A network of 20 x 10 squares is given to you.

Can you calculate how many unique squares and rectangles can be formed combining two or more individual squares ?

John was visiting his friend Jacob. He found out that his friend's wife had just killed a burglar in self-defense.
John asks Jacob about what happened and he told that "His wife was watching television when suddenly the bell rang. She thought that it is her husband Jacob but she found the burglar who attacked her instantly and she got so frightened that she killed the burglar immediately with the knife.
John asked the police to arrest his friend's wife. Why?

When monkey rotate the gear, which mark will be hit 1 or 2 ?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

Why is 6 afraid of 7?

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?