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

Our product and our sum always give the same answer. Who are we?

In the attached figure, you can see a chessboard and two rooks placed on the chess board. What you have to find is the number of squares that do not contain the rooks. How many are there?

In a box, there is a jumble of 7 red balls, 6 blue balls, 5 green balls, and 4 yellow balls. What is the minimum number of balls, will you have to pick up so that you have at least 4 balls of the same colour?

Can you count the number of blocks in the picture below?

What can go up a chimney down, but can’t go down a chimney up?

Can you name three consecutive days without using the words Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday?

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.

What is so fragile that saying its name breaks it?

A worker is to perform work for you for seven straight days. In return for his work, you will pay him 1/7th of a bar of gold per day. The worker requires a daily payment of 1/7th of the bar of gold. What and where are the fewest number of cuts to the bar of gold that will allow you to pay him 1/7th each day?