What is the coolest letter in the alphabet?

What kind of tree can you carry in your hand?

Can you calculate the probability of getting a sum of six when a dice is thrown twice?

The day after tomorrow will be three days before Tuesday. Can you find out what is today?

A number can be multiplied by multiple of nine
i.e 9 18 27 36 45 ...

and the resulting number consist of only one digit.

Can you identify the number ?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

A mathematician couple was having a Frappuccino in Starbucks sitting opposite to each other. Suddenly the guy noticed the text written on the paper in front of them and exclaimed that it was wrong. The girl denied it and said it is appropriate. Both are correct. What is written on the paper?

You have two strings whose only known property is that when you light one end of either string it takes exactly one hour to burn. The rate at which the strings will burn is completely random and each string is different.

How do you measure 45 minutes?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

A 52% bias toss for head using the 51% tail bias coin was done to obtain a fair result.

Can you find how bias is the floor in this case?