There is a shop where written:
Buy 1 for $1
10 for $2
100 for $3
I needed 999 and still only paid $3. How could this be financially viable for the shop-keeper?

There is a place where if I stand up straight, I will still be considered sideways.

Can you write down eight eights so that they add up to one thousand?

A man is found dead with a knife in his back When the investigation is done. A chair lays beside him and the forensic team finds moisture around the body.

If he committed suicide, how did he do it?

A family is trapped in a jungle. There is a bridge which can lead them to safety. But at one time, the bridge can only allow two people to pass through. Also, all of them are afraid of the dark and thus, they can't go alone.

Father takes 1 minute to cross, the mother takes 2 minutes, the son takes 4 and the daughter takes 5 minutes. While crossing the time taken will be according to the slower one. How can they all reach the other side in the minimum possible time?

Replace the letters of words with a number so that the below equation holds true

BASE +
BALL
---------
GAMES
----------

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

I am the black child of a white father, a wingless bird, flying even to the clouds of heaven. I give birth to tears of mourning in pupils that meet me, even though there is no cause for grief, and at once on my birth, I am dissolved into air. What am I?

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

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?