A new Engineering building containing 100 offices had just been completed. John was hired to paint the numbers 1 to 100 on the doors. How many times will John have to paint the number nine (9)?

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

A woman named Maria was at the funeral of her mother. She met a nice young man that she had never seen before and after the service, they spent a bit of time together. Then she got busy and didn’t get his name or phone number before he left. She tried to find him, but no one knew who he was or how to contact him. A few weeks later, Maria’s older sister dies and the police suspect murder. Who killed the sister?

Can it be possible to build a house that has all its four walls facing towards the South?

Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

A prisoner is told: "If you tell a lie, we will hang you and if you tell the truth, we will shoot you." What did the prisoner say to save himself?

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

Which digit occurred maximum times between the number 1 and 1000?

What demands an answer, but asks no questions