Solve the mathematical equation in the picture below.

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

Outside a massage parlour, there is a board that reads
"I only massage those who do not massage themselves."

Reading the above statement, does the masseur massage himself?

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

You can find some missing letters in the picture. By placing two particular letters in the spaces, you can form a nine lettered word beginning from one of the corners and going clockwise direction to the middle. Can you find out the letters and the word?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

What Deficiency does the below rebus represent?

VIT_MIN

If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?

How many sides does a circle have?

I have four wings but can't fly.
I express no emotions.
I am found on the exact spot every time you look.
I keep toiling away with a little sound.

Do you know what am I?