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

I don't get anymore wetter, no matter how much rain falls on me.

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

There are nine letters in the below-given diagram. You have to form a nine-letter word using these letters.

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

Can you replace the question mark with the correct number in the below table sequence?

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

Two guards were on duty outside a barracks. One faced up the road to watch for anyone approaching from the North. The other looked down the road to see if anyone approached from the South. Suddenly one of them said to the other, "Why are you smiling?"

How did he know his companion was smiling?

How can I get the answer 24 by only using the numbers 8,8,3,3?

You can use the main signs add, subtract multiply and divide.

Your last good ping-pong ball fell into a narrow metal pipe embedded one foot deep in concrete.
How can you get it out undamaged, if all the tools you have are your tennis paddle, shoe laces, and plastic water bottle, which does not fit into the pipe?