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

Name a key which is hardest to turn.

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

There is so small cabin inside a deep forest.
All the forest burned out to worst possible but the inside of the cabin is still the same.
However all the person inside the cabin die.

How come ?

It is raining today at 11:59 am. What is the probability of sunny weather after 72 hours?

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?

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

You need to move three matchsticks to form three squares. Can you do it?

What is at the end of a rainbow?

what does the below rebus mean?