There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

There was a strange boy who was born before his father. How can this be possible?

I was speeding and ran through a stop sign, yet two traffic officers who were there do nothing about it.

why?

What question can you never answer yes to?

When we see 2 but call 10?

Can you name three consecutive days without using the words Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday?

What's the best place to go shopping in the ocean?

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

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

There are five people. One of them shot and killed one of the other five.
We know following clues:
1. Dan ran in the NY City Marathon yesterday with one of the innocent men.
2. Mike consider being a farmer before he moved to the city.
3. Jeff is a top notch computer consultant and wants to install Ben new computer next week.
4. The murderer had his leg amputated last month.
5. Ben met Jack for the first time six months ago.
6. Jack has been in seclusion since the crime.
7. Dan used to drink heavily.
8. Ben and Jeff built their last computers together.
9. The murderer is Jack's brother. They grew up together in Seattle.

Consider yourself to be a famous detective "Sherlock Homles", Can you find the killer?