Can you find out which number multiplied by itself will give the output as 12345678987654321?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

There is something which you can be arrested for attempting but not for successfully completing.

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

Which is heavier: a ton of bricks or a ton of feathers?

When it's bad luck to meet a black cat?

I am 5 letters long.
My first two tell you who I am
My first 3 could be a medicine
My last three reversed could be a young boy.
My 4th, 3rd and 2nd in that order could be a fruit drink.
If you have me you may hang me round your neck
WHAT AM I ?

Two-person want to cross a river. Only one boat is present on the riverside that can carry only one person at a time.

However, they still manage to cross the river. How is it possible?

You are in a land where thirty men and two women were dressed in classic black and white dresses.
They begin to fight as soon as any of them move.

Where are you?

Which number should replace the question mark?