The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

what does the below rebus means?

There is a brick of gold and a brick of iron in a boat (both 10-inch blocks), if they are both dropped into the water which will make the water level higher?

If eleven plus two equals one, what does nine plus five equal?

A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

I have two coins.
* One of the coins is a faulty coin having a tail on both sides of it.
* The other coin is a perfect coin (heads on side and tail on other).

I blindfold myself and pick a coin and put the coin on the table. The face of the coin towards the sky is the tail.

What is the probability that another side is also tail?

My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

What can go through glass without breaking it?