How can one talk without saying a single word?

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

Why did Buffon take the goal with him after every Juventus match?

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?

If an electric train is travelling south, then which way is the smoke going?

People put me on the table and cut me but do not eat me. What am I?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

Find the next number in the sequence

5 12 24 36 ?

How can you make number one disappear by adding something to it?

There are hundred red gems and hundred blue gems. The blue gems are priceless while the red gems equal wastage. You have two sacks one labeled Heads and the other Tails. You have to distribute the gems as you want in the two sacks. Then a coin will be flipped and you will be asked to pick up a gem randomly from the corresponding sacks.

How will you distribute the gems between the sacks so that the odds of picking a Blue gem are maximum?