What do you answer even though it never asks you questions?

Complete the table series riddle by finding the number that can replace "??".

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

What two things can you never eat for breakfast?

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?

Find the missing letter in the last circle logically in the given below picture.

what does the below math rebus puzzle mean?

I am sure no one can have two things for dinner. what are they?

How old is your son? asked a man to his neighbour. My son is five times as old as my daughter and my wife is five times as old as my son. I am twice as old as my wife whereas my grandmother, who is celebrating her eighty-first birthday is as old as all of us put together.

How old is the man's son ?

What is always in front of you but can’t be seen?