John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

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

How can you tell a raw egg from a hard-boiled egg?

Can you decipher these quotes by Albert Einstein?
Blf xzm mvevi hloev z kilyovn lm gsv ovevo lm dsrxs rg dzh xivzgvw.

A kind heart person buy packed food at 3$/packet from United states and sells them at 1$/packet at Africa. After some time he becomes a millionaire.

How come the guy become millionaire ?

You are stuck on an island where you have nothing. You find four pieces of paper somewhere on the island. What will be your strategy to escape from the island safely?

PS: No other resource is available to you on the island, neither can you build anything.

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

In the image given, you can find several triangles. Can you count them all?

If "P" means "-", "Q" means "/", "R" means "+", and "S" means "*" then find the value of the following:

21 Q 7 R 9 S 10 P 13

I don't get anymore wetter, no matter how much rain falls on me.