What always comes into a house through the keyhole?

A man lives on the fifteenth floor of an apartment building. Every morning he takes the elevator down to the lobby and leaves the building. In the evening, he gets into the elevator, and, if there is someone else in the elevator, or if it was raining that day, he goes back to his floor directly. Otherwise, he goes to the tenth floor and walks up five flights of stairs to his apartment. Can you explain why he does this?

What number do you get when you multiply all of the numbers on a telephone's number pad?

Find the value of "?" in the ball picture Riddle below:

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

who is silent in the parliament?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

Find the missing letter in the last circle logically in the given below picture.

A person was found dead on a big green land with no trees or buildings around. When the police arrived, they found a piece of rock lying next to him and the man was wearing clothes comprising of red, blue and yellow colours.

Can you tell who the person is and what was the cause of death?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?