The more of this there is, the less you see. What is it?

Be active and find the killer in the picture Riddle below.

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?

A patient was diagnosed with some ailment. He was given five different tablets to take at night at an interval of 15 minutes.

How long will it take the patient to consume all the five tablets?

The dirtier I get, the whiter I look. Who am I?

Can you count the number of lines in the below picture?

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

You are a prisoner sentenced to death. The Emperor offers you a chance to live by playing a simple game. He gives you 50 black marbles, 50 white marbles, and 2 empty bowls. He then says, 'Divide these 100 marbles into these 2 bowls. You can divide them any way you like as long as you use all the marbles. Then I will blindfold you and mix the bowls around. You then can choose one bowl and remove ONE marble. If the marble is WHITE you will live, but if the marble is BLACK... you will die.'

How do you divide the marbles up so that you have the greatest probability of choosing a WHITE marble?

Find the next number in the following series:
6, 14, 26, 98, __?

In two decks of cards, what is the least amount of cards you must take to be *guaranteed* at least one four-of-a-kind?