Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

Count the number of triangles in the picture below:

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

In the given picture, in how many ways can you read the word "Tiger"?

A 3 digit number is such that it's unit digit is equal to the product of the other two digits which are prime. Also, the difference between it's reverse and itself is 396.

What is the sum of the three digits?

Can you find out the missing number in the grid?

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?

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

I am the fastest animal but cannot climb the tree. What am I?