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

Imagine you are in a room with no windows or doors. How will you get out?

What do you think with the below Picture ?

As we know that white starts the game of chess. Can you find the scenario shown in the picture below is possible when all the white pieces are at the original place while the black pawn is not as in the below picture?

Rectify the following equality 101 - 102 = 1 by moving just one digit.

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

I am beautiful, up in the sky. I am magical, yet I cannot fly. To people I bring luck, and to some people, riches. The boy at my end does whatever he wishes. What am I?

I am the beginning of everything, the end of everywhere. I'm the beginning of eternity, the end of time and space. What am I?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

The captain of a ship was telling this interesting story: "We travelled the sea far and wide. At one time, two of my sailors were standing on opposite sides of the ship. One was looking west and the other one east. And at the same time, they could see each other clearly." How can that be possible?