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

What will you call your mother's brother's brother-in-law?

Which is Odd One Out and why?

4377

3954

9862

8454

9831

What do you see in the given picture?

How many triangles are there in the picture below?

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

Three men in a cafe order a meal the total cost of which is $15. They each contribute $5. The waiter takes the money to the chef who recognises the three as friends and asks the waiter to return $5 to the men.

The waiter is not only poor at mathematics but dishonest and instead of going to the trouble of splitting the $5 between the three he simply gives them $1 each and pockets the remaining $2 for himself.

Now, each of the men effectively paid $4, the total paid is therefore $12. Add the $2 in the waiters pocket and this comes to $14. Where has the other $1 gone from the original $15?

This is a picture puzzle. You have to guess the name of the movie that can be related to the picture.

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

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?