What always comes into a house through the keyhole?

How old is your son? asked a man to his neighbour. My son is five times as old as my daughter and my wife is five times as old as my son. I am twice as old as my wife whereas my grandmother, who is celebrating her eighty-first birthday is as old as all of us put together.

How old is the man's son ?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

A train leaves from point A for point B at 80 mph. After half an hour, another train leaves from point B for point A at 60 mph.

Which of the trains will be farther from point A when they meet ?

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

The current time can be represented by below textual rebus.

0
=========
B.Sc
LLB

Can you tell us the current time?

On one occasion, A Boy collects 71 rupees in form of 20 paise and 25 paise. He collects a total of 324 coins.

Can you tell me how many 20-paisa and 25-paisa he got?

What kind of band never plays music?

There was an aeroplane crash, every single person died, but two people survived. How is this possible?

what's the probability of getting a king or a queen from a pack of 52 cards?