If you say my name, I will no longer exist. What am I?

How can you take 2 from 5 and leave 4?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

What is red and smells like blue paint?

Can you find out which options fits best with the missing column?

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

Where do fish keep their money?

What you cannot hold but it is yours?

Birbal was jester, counsellor, and fool to the great Moghul emperor, Akbar.
The villagers loved to talk of Birbal's wisdom and cleverness,
and the emperor loved to try to outsmart him.
One day Akbar (emperor) drew a line across the floor.
"Birbal," he ordered, "you must make this line shorter, but you cannot erase any bit of it."
Everyone present thought the emperor had finally outsmarted Birbal.
It was clearly an impossible task.
Yet within moments the emperor and everyone else present had to agree that Birbal had made the line shorter without erasing any of it.
How could this be?

Prove that the below maths equation is true.

8 + 8 = 91