When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

How can a man go eight days without sleep?

In one of the popular batman series movie "Batman Forever", there was a riddle that goes like "Tear me off and then scratch my head and I was red then and now I am back. Who am I?

You are playing a game with your friend Jack. There are digits from 1 to 9. You both will take turn erasing one digit and adding it to your score. The first one to score 15 points will win the game.

Would you want to play first or second?

PS: The sum should be exactly 15.

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

As shown in the image, the nine Dogs are square fenced. By constructing just two square fences can you make sure that two Dogs cannot meet each other without crossing the fence?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?

Imagine you are in a room with no windows or doors. How will you get out?