You have two strings whose only known property is that when you light one end of either string it takes exactly one hour to burn. The rate at which the strings will burn is completely random and each string is different.

How do you measure 45 minutes?

Every words stands for unique digit that makes the arithmetic equation true

SEVEN + SEVEN + SIX = TWENTY.

What are the digits ?

2, 3, 5, 9, 17, _ What is the next number in the sequence?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

What occurs twice in a week, once in a year but never in a day?

What is the riddle which can be asked all day with a different correct answer each time.

People make me, save me, change me, raise me. What am I?

Count the number of squares in the picture below.

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?