What does this rebus puzzle means ?

The following "Brain Bat" means Slow Down.
S
L
O
W

Using the same logic, can you tell us what does the following Brain Bat means ?
E
V
I
G

What does this mathematical rebus means ?

Can you find the missing number in the third row?
35 20 14
27 12 18
5 2 ?

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

No matter how little or how much you use me, you change me every month. What am I?

Women do it once a year after they turn 19 but men get to do it only once in a lifetime. What is it?

Why is the Hole below a Lock?

In the following picture, E is going to slide the object down and as per the terrain and the physics, the round object is going to travel all the way till the end. Now, can you analyze who all people will die when it happens?

Queen Elizabeth organised a royal party.

To Avoid uninvited guest royal family set a password.
Jack (an uninvited person) plan to enter the party. He stand nearby the door.

First guest comes, the security person said 'twelve' and guest replied with six.
Second guest comes , the security person said 'six' and guest replied with 'three'.

Jack thought is enough and he walked to the entry point. The security person said 'eight' , Jack replied smilingly 'four'.
He was immediately thrown out of the party. why ?