It's a 7-letter word.
If we remove 1 letter from it, it remains the same.
If we remove 2 letters from it, it remains the same.
If we remove 3 letters from it, it remains the same.
If we remove all the letters from it, still it remains the same.
What is it?

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

The average age of 10 members of a committee is the same as it was 4 years ago, because an old member has been replaced by a young member. Find how much younger is the new member ?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

If your uncle’s sister is not your aunt, what relation is she to you?

Make a sentence consisting of three words that have the whole alphabet.

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

A number can be multiplied by multiple of nine
i.e 9 18 27 36 45 ...

and the resulting number consist of only one digit.

Can you identify the number ?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

Three ants are going up a hill, one behind the other. The last ant then says to the other ants, 'There is an ant behind me!'' How come?