What always comes into a house through the keyhole?

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

What have one eye but still cannot see?

With the help clues provided in the image, can you find the 5 digit key?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

Mother's Name is Mrs. SIXTY TWO
Son's Name is FIFTY TWO
Daughter's Name is FORTY TWO
What is Name of Father?

Sherlock Holmes was challenged to make a pre-drawn line smaller without erasing it. He did it in fractions of seconds. How?

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

A four-digit number (not beginning with 0) can be represented by ABCD. There is one number such that ABCD=A^B*C^D, where A^B means A raised to the B power. Can you find it?