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

Jim and Sarah are in a long-distance relationship. Jim buys an engagement ring for Sarah and wants to mail it to her. Unfortunately, the only way to ensure the ring will be received is to place a lock on the package. Jim has locks and Sarah has locks, but neither has keys for each other’s locks. How can they make sure the ring isn’t stolen?

I have four wings but can't fly.
I express no emotions.
I am found on the exact spot every time you look.
I keep toiling away with a little sound.

Do you know what am I?

Can You Find the Missing Zero? A Number Puzzle that Will Trick Your Eyes

By adding four matchsticks, can you divide the square shown in the picture into two equal parts?

Christina makes tasty toast in a small pan. After toasting one side of a slice, she turns it over. Each side takes 30 seconds. The pan can only hold two slices.
How can she toast both sides of three slices in 1 & 1/2 instead of 2 minutes?

What is Luis Suarez's (Soccer Player) favorite tea?

Count the squares in the matchstick puzzle below?

What is the fastest way to double your money?

If your uncle’s sister is not your aunt, what relation is she to you?