In the city of Brain Teasers, 5% of people do not list their phone numbers. Now if we select random 100 people from the phone directory, then how many people selected will have unlisted phone numbers?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

There is a box. The area of its top is 240 square units, the area of the front is 300 square units and the area of the end is 180 square units.

Can you calculate the dimensions of this box with the given data?

I add 5 to 9 and get 2. The answer is correct, so what am I?

What happened when the wheel was invented?

A bomb exploded in a room full of married couples and no one died. How?

Sachin bought a car with a strange 5 digit numbered plate.The water image of the number is 78633 more than my car number. All the digits of car number are distinct.

What is the original number on number plate?

Intelligence Agency need to break the vault but the problem is that they are not able to break the vault.

On the vault, a text is written as:

31 11 33 33 43 45
21 25
31 24 11 31 51 41

To Break the code Intelligence Agency brings a mathematician named Joseph.
Minutes later he deciphers the code.

Whats the code?

What has 13 hearts but no other organs?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?