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?

What is the last thing you take off before bed?

10+10 and 11+11 can give you the same answer.

Explain how?

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

Christina is older than Kareena and Karishma. Katrina is older than Karishma and younger than Kareena. If Kareena has a brother named John, who is older than Christina, who's the youngest?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

I start and end with 500 and carry a 5 in my heart. But I require the first letter and the first number to be complete. I am the name of a King.

Who am I ?

Find out a multi-digit number that if multiplied by the number 9 or any of its multiplications products (i.e. 18, 27, 36, 45,..) will result in the multiplication factor repeated (n) number of times.