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?

Take number 1000 and then add 20 to it.
Now add 1000 one more time.
Now add 30.
Now add 1000 one more time.
Now add 40.
Now add 1000 one more time.
Now add 10.

What is the total?

The day after tomorrow will be three days before Tuesday. Can you find out what is today?

John can place six large boxes or nine small boxes into a carton.

Can you find out in how many cartons can he place sixty-six boxes in total?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

What can jump higher than a building?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

In a certain country ½ of 5 = 3. If the same proportion holds, what is the value of 1/3 of 10?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

What number should come in place of the question mark below?