I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

Can you find out which options fits best with the missing column?

What is the next number?

77, 49, 36, 18 ?

When 99 is considered higher than 100?

What word is represented by this rebus?

I am a five-letter word and comprises two different vowels and three same consonants. I am so strong that I can spoil your entire work.

Can you find out who am I?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

If eleven plus two equals one, what does nine plus five equal?

Who has married many women but was never married?

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?