An infinite number of mathematicians are standing behind a bar. The first asks the barman for half a pint of beer, the second for a quarter pint, the third an eighth, and so on. How many pints of beer will the barman need to fulfill all mathematicians' wishes?

The doctor advised his patient to take a tablet after every fifteen minutes. He gave him five tablets in total.

How much time will he take to have all the five tablets?

Can you find the dog hidden in a group of pandas?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

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

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

Different lights make me strange by changing me into different sizes. What am I?

In the picture, you can see a chess board. On the top left position, the K marks a knight. Now, can you move the knight in a manner that after 63 moves, the knight has been placed at all the squares exactly once excluding the starting square?

Rearrange the letters in "new door" to make one word.

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