Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

Find the smallest sentence with all the English alphabet.

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

Replace the question mark with the correct number.

2 + 2= 4
3 + 3= 18
4 + 4= 48
5 + 5= ?

What runs around the whole yard without moving?

In the attached figure, you can see a chessboard and two rooks placed on the chess board. What you have to find is the number of squares that do not contain the rooks. How many are there?

Can you spot the hidden girl in the picture below?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

What kind of storm is always in a rush?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?