Count the number of balls in picture below:

what's the probability of getting a king or a queen from a pack of 52 cards?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

You can find some missing letters in the picture. By placing two particular letters in the spaces, you can form a nine lettered word beginning from one of the corners and going clockwise direction to the middle. Can you find out the letters and the word?

A man hijacks an aeroplane transporting both passengers(8 of them) and valuable cargo. After taking the cargo, the man demands nine parachutes, puts one of them on, and jumps, leaving the other eight behind. Why did he want eight?

Six glasses are in a row. The first three are filled with milk and the last three are empty. By moving only one glass, can you arrange them so that the full and the empty glasses alternate?

A man was gazing through the window of the 23rd floor of the building. He suddenly opened the window and jumped on the other side of the window. On landing on the floor, there was not a sheer mark of injury on him.

How can that be possible if he did not use any kind of parachute and did not land on a soft surface?

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

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?