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

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

We know that the number 7 is the prime followed by a cube. Which next number is also a prime followed by a cube?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

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

There is a square piece of paper with a hole that is denoted by the circle on the top right side in the given picture. You have to cut the paper in a manner that it forms two and only two separate pieces of paper and then rearrange the pieces in a manner that the holes come in the centre of the paper.

John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?

A crime was committed at baker street. Ibrahim Dakota who was shot in the stomach was the main suspect. Sherlock questioned the suspect. The conversation started as:
Sherlock: What's your story, Ibrahim?
Ibrahim: I was walking around baker street and suddenly a man from the back shot me. I ran as fast as I could to save my life".
Sherlock: That is enough (and ask the police to arrest him).

Why does Sherlock think he is the murderer?

A non-stop marathon is the shared favourite sport of three brothers.

*The oldest one is fat and short and trudges slowly on.
*The middle brother's tall and slim and keeps a steady pace.
*The youngest runs just like the wind, speeding through the race.

"He is young in years, we let him run!" the other two brothers explained, "'because though he is surely number one, he is second, in a way." Why is it?